Yes, there are Gtders with YouTube channels. I happen to be one of them.

Ready-Set-Do! YouTube Channel
http://www.youtube.com/readysetdo

Videos @ ReadySetDo.com
http://readysetdo.com/videos

I also have a blog, but it is mainly text. Though I like your idea of more visual posts. I've got some notes from my years of learning GTD. I'll have to consider some more visual ways of incorporating them as you suggest.