No to the video, yes (and have utilized it) to the coaches advise. A coach is usually pretty good at giving you advise for something easily applied, like straighten your legs, look left, stop looking like you want to murder your partner, don't forget about connection in Latin/rhythm, those kinds of things that are a quick fix that will make it a better performance.
Not only a no to watching it, I don't think I would really ever have time to watch it between rounds. Because not only would I need the time to watch it, I would also need the time to process it, figure out what was wrong, and figure out how to fix it... probably not gonna happen in the 3-5 minutes there may be between rounds, if I'm lucky enough to come off the floor between rounds. I'm too analytical, I want time to process everything.