Wow. Awesome.
Just as a data point for poor indie devs like me - for my own minimalistic app demo video (http://www.mindscopeapp.com), I created a bridge over my iPad using my kids' Duplos, stuck my iPhone 4S on top, made sure there was enough light, and recorded me using the app for a few minutes. I then edited the video with iMovie on iPad and wrote a quick little doodle on Garage Band as the music.