Unfortunately, as Denis says, it's probably doubtful that a dashcam will deter them. They don't care. I've mentioned before that there are even cases where people have been physically threatened when they have tried to intervene.
On another thread, I mentioned looking at cars at Copart sites, where most of the insurance salvage goes now. You now see quite a few mk1 Jazzes going through, written off after being relieved of their cats, every week.