The feature of embedding video from many popular sites like 'YouTube' has been added to the site. In addition if you go to your 'User Control Panel' the last option is for adding a video to your personal profile.
Just paste the URL that is in the top browser URL window, do not use the embed code that some sites offer, just the straight URL into the post or box in you CP.
DO NOT USE URL OR IMG TAGS, just the straight http URL.
Known Issue: It only works in new post or new reply, if you edit and old reply and add the URL the system doesn't parse the URL and recode it. Sorry, that is the current limitation something about new post triggers the system to rewrite the code. If I figure something out I will fix it.
Example thread:
Charlie Rose - Interviews with Architects
Enjoy!