Yes, you would need to make them unidentifiable by blurring their face, anonymizing their voice and any other feature that may identify them.
Wide shots of crowds are generally ok in public, the issue is focusing on specific people. For example someone having a mental breakdown in public.
You also can not have door bell or private cameras pointing to public streets/roads. You have to ensure your camera only records your property and you are required to post a sign that a camera is installed.
It may or may not be OK to record without having a notice if your intention is a specific private use, like your own legal defense. It would certainly not be OK to publish a video clip of a specific person you encountered that may be embarrassing.
For example, you can be fined for publishing footage of an accident where someone was hurt and may feel embarrassed that other see them in that condition, but it may be OK to give it to police or legal council of people involved.
Jein (German word joke that combines Ja & Nein / Yes & No).
The short answer is: they are allowed BUT. There are many privacy rules that prohibit the actual use of these recordings (not limited to publishing but in court as well).
Wide shots of crowds are generally ok in public, the issue is focusing on specific people. For example someone having a mental breakdown in public.
You also can not have door bell or private cameras pointing to public streets/roads. You have to ensure your camera only records your property and you are required to post a sign that a camera is installed.