I agree when it comes to Enterprise resources and accessing the employer's network, however the OP is just talking about a restriction on the camera, not accessing the network.
Again, I think you and I are looking at apples and oranges. If the OP is talking about the access you are suggesting, then compliance with security and access to the personal device is necessary. However, I was just referring to a restriction to the camera and not allowing the employer access to a personal device to deploy a profile for the sole purpose of camera restriction.
Thank you for a different perspective.