There's Oversight [1] and Little Flocker [2] from Objective-See which can tell you if something is attempting to user the microphone or webcam, and allow you to

There's Oversight [1] and Little Flocker [2] from Objective-See which can tell you if something is attempting to user the microphone or webcam, and allow you to block it if you'd like. [1] https://objective-see.com/products/oversight.html https://objective-see.com/products/oversight.html [2] https://www.littleflocker.com/ https://www.littleflocker.com/