Micro Snitch is described as 'Ever wondered if an application records audio through your Mac’s built-in microphone without your knowledge? Or if the camera captures video for no good reason?' and is an app in the Photos & Graphics category. There are three alternatives to Micro Snitch for Mac. The best alternative is Little Snitch. It's not free, so if you're looking for a free alternative, you could try OverSight or Micro Sniff.
Mac malware often spies on users by recording audio and video sessions...sometimes in an undetected manner. OverSight monitors a mac's mic and webcam, alerting the user when the internal mic is activated, or whenever a process accesses the webcam.