I saw a tweet the other day that mentioned YouTube was testing out a feature that would let you ask questions of your views throughout the video. I think that is a pretty great feature for educators. Apparently, you could go to your analytics page to get the answers. Here is where you can turn on the feature or turn it off.
That is it. Sorry no movie that I could find. But, for those of us that use screen casting regularly in class, it could be a very cool feature.