Video is definitely good, and the more information it can give about the class the better.
Things to think about are:
How to get good video. This needs someone in a rib (who is therefore prepared to give up some sailing time), who understands cherubs and how to take good video of them. Just driving alongside doesn't give the impression of speed.
Getting some good conditions with a few different boats present. Blasts seem to be the most likely candidates. Alternatively we could just cut something together from different people's footage, but we'd have less fun doing that
Anyone volunteering to do voice-over?
Audio may not be ideal for dinghy show, but would work well on youtube.