E24 I have installed the Google Camera app and Google Photos (for editing pictures) in a profile in which GSF, Google Play services and Google Play Store are running anyway. However, Google Camera and Google Photos seem to run without GSF, as stated here.
Permissions I give to Google Camera: Camera, Microphone (each: ask ervery time), Sensors (for portrait or landscape).
Network only needs to be enabled from time to time, e.g. when new features need to be loaded (e.g. Audio Eraser, Unblur, Magic Eraser).