BuddyPress.org

Hi,

BuddyPress hasn’t a video player. By default, BP use WordPress embeds. Read attentively this document, to understand how embeding videos is working and how READING videos is automatted.

If you want thumbnails in place of the default wrapper, you could use some plugin like this one (untested). And they’re many other on the plugin repo. Only thing you have to take attention with such a plugin, is his compatibility with BP. For ex. wall activities are not exactly blog posts.

If you’re comfortable with CSS, you can even try to modify the existing wrapper size.

Note also that all of these tips have not very much to do with BuddyPress, but with theming.