I can't speak to the laws in other nations but in the US it depends a lot on where they're recording. If you're just out on the street, it's not only not a crime to record in public, it's a protected right. So if you punch them they'd be solidly in their rights to mace you or break your legs, maybe even shoot you in many states. And then have you arrested and force you to pay for a new pair of glasses.

But if they were doing that shit on private property or somewhere worse like a restroom, give them the ol western bouncer treatment and send them flying out the door with a broken pair of glasses. I mean you could assault them out in public too, but there could be some unpleasant consequences.