Are people going to post the videos on their own youtube accounts and then use those in their blog post? If so, are the moderators going to download and re-up them to a DIY.SE YT account?
If not, how are they going to be submitted, and what web site is going to distribute them? SE could host the videos themselves, but are they willing to deal with the bandwidth issues?
Anyways, it shouldn't be all that hard to take care of, but it seems like something that needs to be addressed.