This protest, I can get behind. The equivalence is much greater and they've targeted the people doing the surveillance.
I don't see anything wrong with this practice? It's just parking enforcement.
In my area, whenever a parking warden issues a ticket, they have to take photographs of the violation (the vehicle parked on yellow lines, expired ticket, etc.), of the ticket on the vehicle (stuck to the windscreen, under a wiper blade), showing the license plate, as well as the relevant parking signage.
Why do they do this? Because in the past motorists have tried every trick in the book to get out of fines. They weren't parked illegally, their ticket hadn't expired, they never received the fine, the signage was missing, obscured or incorrect.
It's a cat and mouse game, and if the last trick up the councils' sleeves is to record the parking infringement on video, then so be it.