Having the example be a video that changes was confusing at first, and if you are going to show me something that is changing, I would like to be able to rewind to the beginning. But really I just think it's a bad idea to show something like that without making it obvious what it is.
I liked the video-example, it's way better than examples in many projects that use just text, when the tool does something quite complex that better be demonstrated in a video with a narrator explaining what's happening and why.
