Not sure if ZK is the right way of achieving this. Even if the cryptographic guarantees are strong, generating these proofs is very expensive.
I think it's very likely the next iPhone will have some form of authenticity proof too, I just hope Apple doesn't go with its own standard again that's incompatible with everything else.
C2PA requires trust that manufacturers would not be materially modifying the scene using convolutional neural networks to detect objects and add/remove details[1]
1) https://www.samsung.com/uk/support/mobile-devices/how-galaxy...