I think this is EU-wide, not just in Germany. Reading http://regulatingforglobalization.com/2019/10/18/video-surve..., “outright verboten” probably doesn’t apply anymore, but it remains close.

As you say, it’s a human rights issue. This case is GDPR. That could apply in cases where videoing itself is allowed, but, say, the videos are insufficiently protected against viewing by the general public.