Sorry to hear about this but, the cops don't do ish, so why get them invloved? Then If you hurt the person involved, the cops come for you. If you have a tape just find out who they are by posting pics then goto they're house or job. Going to their job has worked best for me in the past. You can just sit around and wait for them to get off... Goodluck finding them. people who don't want to be found, are hard to find.