Now this is how you start a video competition!
You invite people to submit a video using the competition moderators own raw video footage choices.
Each competitor can choose the track/s they want to use to create the final submitted video. Points could be added for having the highest rated, earliest completed and submitted video. There could also be a cap on the video size and duration. Again points could be added for having the longest duration, highest quality, smallest file size video. In other words, a nice compact, quick downloading video. The actual goal could be for a real, sponsored (paid for) advertisement. So there would be a monetary prize and the glory of seeing your video premiered.
What does everyone think about this idea? Think about it.
What additional ideas do you have to this competition format?