I would use and enjoy being able to post videos. However, not just youtube (you said youtube etc., but I want to be clear).

For example, I post videos on imgur.com, where I keep most of the photos I post on the site as well. However, currently, I cannot put the videos in a post. I have to share the link and have site users click the link and go to imgur.com to see the video. That's not ideal.

It would also be great to see other users videos as well.

To sum it up; I am all for being able to post and view videos on the site.