Does macOS keep iSight Camera usage logs?
Solution 1:
On recent hardware with the T2 chip and new macOS - the camera is controlled in firmware and Apple makes it clear when it's engaged.
Look for a product like MicroSnitch to let you know when recording is happening - whether it's a legitimate program or a covert one.
- https://obdev.at/products/microsnitch/index.html
As long as you are on El Capitan or newer, I have seen zero cases where this isn't a solid detection mechanism.