Actually, there's already a fair number of things like this that pop up on Youtube.
I've actually wanted to do something along these lines myself, I just don;t have a camera to do it right now. One thing to make note of though, get permission from the booths and stuff. I know I've had a couple booths where the owners asked me not to take pictures... Generally the "craft" booths (A boot place a couple years ago, and a ren-faire costume type booth, both said something about not wanting photos of some of their designs posted online, or some such).
Bull