I want to automate a personal workflow that is based on camera usage on my MBP. Basically I want to know if any of the cameras (built-in or USB) has been turned on or off, so I can run a program or script I'll create. I think it's OK if I need to poll for the cameras statuses but an event or callback based solution would be ideal
![MacOS - detect when camera is turned on/off](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)