This is a great reference. I don't have time right now (because my classes are just starting, but I do use videos extensively in my courses. I don't do the YouTube thing, however. Within Moodle, I provide a (URL resource) link to my own Flash player, and I also feed the videos using Moodle's RSS feed capability. I also podcast videos on iTunes.
So I would really like to review these instructions (.../23/en/Video) and maybe provide some feedback to you, maybe trying some different approaches.