BuddyPress.org

well I was trying post the my code, but I think I spammed myself after trying to edit the reply to this …
CPT (and custom title thing)

add_action('init', 'video_register_my_cpt');
function video_register_my_cpt() {
register_post_type('video', array( 
'label' => 'Videos',
'description' => 'Latest Videos',
'public' => true,
'show_ui' => true,
'show_in_menu' => true,
'menu_position' => 5,
 'show_in_nav_menus' => false,
'capability_type' => 'post',
'hierarchical' => false,
'rewrite' => array('slug' => 'videos'),
'query_var' => true,
'has_archive' => true,
'exclude_from_search' => false,
'supports' => array('title','editor','excerpt','trackbacks','custom-fields','comments','revisions','thumbnail','author','page-attributes','buddypress-activity'), 
'bp_activity' => array(
            'component_id' => buddypress()->blogs->id,
            'action_id'    => 'new_video',
            'format_callback' => 'bp_blogs_format_activity_action_new_blog_post',
            'comment_action_id' => 'new_video_comment',
            'comment_format_callback' => 'bp_activity_format_activity_action_custom_post_type_comment',
            'contexts'     => array( 'activity', 'member' ),
            'position'     => 40,
            ),
  'taxonomies' => array('video_category','video_tag'),
  'labels' => array(
  'name' => 'Videos',
  'singular_name' => 'Video',
  'menu_name' => 'Videos',
  'add_new' => 'Add Video',
  'add_new_item' => 'Add New Video',
  'edit' => 'Edit',
  'edit_item' => 'Edit Video',
  'new_item' => 'New Video',
  'view' => 'View Video',
  'view_item' => 'View Video',
  'search_items' => 'Search Videos',
  'not_found' => 'No Videos Found',
  'not_found_in_trash' => 'No Videos Found in Trash',
            
            'bp_activity_admin_filter' => __( 'New video published', 'custom-domain' ),
            'bp_activity_front_filter' => __( 'Videos', 'custom-domain' ),
            'bp_activity_new_post'     => __( '%1$s added <a href="%2$s">[Video]</a>', 'custom-domain' ),
            'bp_activity_new_post_ms'  => __( '%1$s added <a href="%2$s">[Video]</a>','custom-domain' ),
            
            'bp_activity_comments_admin_filter' => __( 'Comments about video', 'custom-domain' ), // label for the Admin dropdown filter
            'bp_activity_comments_front_filter' => __( 'Video Comments', 'custom-domain' ),        // label for the Front dropdown filter
            'bp_activity_new_comment'           => __( '%1$s commented on a <a href="%2$s">video</a>', 'custom-domain' ),
            'bp_activity_new_comment_ms'        => __( '%1$s commented on a <a href="%2$s">[Video]</a>, on the site %3$s', 'custom-domain' )

  )

) ); }

function my_video_include_post_type_title( $action, $activity ) {
  if ( empty( $activity->id ) ) {
    return $action;
  }

  if ( 'new_video' != $activity->type && 'new_video_comment' !=$activity->type ) {
    return $action;
  }

  preg_match_all( '/<a.*?>([^>]*)<\/a>/', $action, $matches );

  if ( empty( $matches[1][1] ) || '[Video]' != $matches[1][1] ) {
    return $action;
  }

  $post_type_title = bp_activity_get_meta( $activity->id, 'post_title' );

  if ( empty( $post_type_title ) ) {

    switch_to_blog( $activity->item_id );

    $post_type_title = get_post_field( 'post_title', $activity->secondary_item_id );

    // We have a title save it in activity meta to avoid switching blogs too much
    if ( ! empty( $post_type_title ) ) {
      bp_activity_update_meta( $activity->id, 'post_title', $post_type_title );
    }

    restore_current_blog();
  }

  return str_replace( $matches[1][1], esc_html( $post_type_title ), $action );
}
add_filter( 'bp_activity_custom_post_type_post_action', 'my_video_include_post_type_title', 10, 2 );

BP CUSTOM

/*////////////////////////////////////////////////////////////////////////////////////////////*/
// Modifying CPT Activity Actions
/*///////////////////////////////////////////////////////////////////////////////////////////*/

function record_blogpost_activity_action( $activity_action, $post, $post_permalink ) {
global $bp;

if( $post->post_type == 'jobs' || get_post_type($post->ID) == 'jobs' ) {
  
  $activity_action  = sprintf( __( '%1$s', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>');

} elseif( $post->post_type == 'video' || get_post_type($post->ID) == 'video' ) {

  $activity_action  = sprintf( __( '%1$s posted a video', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>' );

} elseif($post->post_type == 'post'  ) {

  $activity_action  = sprintf( __( '%1$s posted a blog', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>' );

}  

return $activity_action;
}

add_filter('bp_blogs_activity_new_post_action', 'record_blogpost_activity_action', 11, 3);

/*////////////////////////////////////////////////////////////////////////////////////////////*/
// Modifying CPT Comment Activity Actions
/*///////////////////////////////////////////////////////////////////////////////////////////*/

function comment_activity_action( $activity_action, $post, $post_permalink ) {
global $bp;
if( $post->post_type == 'post' ) {

  $activity_action  = sprintf( __( '%1$s commented on %2$s', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>' );

} elseif( $post->post_type == 'video' || get_post_type($post->ID) == 'video' ) {

  $activity_action = sprintf( __( '%1$s replied on the video %2$s', 'buddypress' ), bp_core_get_userlink( (int) $post->post_author ), '<a href="' . esc_url( $post_permalink ). '">' . $post->post_title . '</a>' );

} 
return $activity_action;

}

add_filter('bp_blogs_activity_new_comment_action', 'comment_activity_action', 11, 3);

/*//// ? /////*/
function bbg_record_video_post_type_comments( $post_types ) {
      $post_types[] = 'video';
      return $post_types;
  }
//add_filter( 'bp_blogs_record_post_post_types', 'bbg_record_video_post_type_comments' );
//add_filter( 'bp_blogs_record_comment_post_types', 'bbg_record_video_post_type_comments' );

doing it this way, everything works except my custom comment action.