I was involved in discussions 20-some years ago when we were first exploring the idea of autonomous and semiautonomous weapons systems. The question that really brought it home to me was “When an autonomous weapon targets a school and kills 50 kids, who gets charged with the war crime? The soldier who sent the weapon in, the commander who was responsible for the op, the company who wrote the software, or the programmer who actually coded it up?” That really felt like a grounding question.
As we now know, the actual answer is “Nobody.”
I believe that’s not the law though. The law outlines the conditions under which a person has an “expectation of privacy.” If you’re inside your house, you have an expectation of privacy and so should not be filmed. If you’re on the sidewalk in public, you have no expectation of privacy. If you’re in a private establishment (restaurant or store for instance), the owner or their representatives can ask you not to record and you have to comply.
All of street photography depends on this kind of legal framework.