Adding youtube to status and forum post is as easy as copying and pasting the url from youtube but the best practice is to use iframe method so that it can detect if the html5 player should be loaded or not.
Any suggestion as to how this can be accomplished for both status and forum posts?
Not recommended. No social site allows you to put code into forms as it creates security holes. If you really don’t care about your sites security you can filter the kses that are in place to stip html tags