Really sucks when they know who it is and still do sweet f.a. about it. About 15 years back my partner and I had a bag of stuff stolen from out campsite. They went through all our bags, and left my med gear thankfully, but took the CDs and player. Locals. In a country, tourist location. Hitting a tourist park. And they still do nothing about it.
Hopefully with your footage they might actually have some punishment handed out to them at some point. Or maybe the karma bus will just hit them instead, which is also good