Depends, if you have a security camera on your own yard it is legal, but if it films the sidewalk it is illegal.

Bitching about things like unlawful camera use is exactly how things like the GDPR get enforced. A lot of people don’t even know that it isn’t allowed.

Heck the police will still use your camera if it is filming the road. They cannot use it as evidence, but it can help them in their investigation. FIlming cars is fine, but it is hard to fil the cars without filiming the people walking or cycling. There is also a balance that needs to be struck between privacy and being able to find/monitor actual criminals. This article from the authority of personal data goes into the Police and their camara use