Oversight for the Mac is constantly running in the background looking out for anything unusual. It monitors any attempts to access your webcam or microphone, as well as known malware threats. Who Stalks My Cam alerts you to any suspicious attempts to take over the attached webcam. You have the option to set up rules for blocking access and keeping logs of webcam access. If you dont want to give any tool this kind of elevated access to your webcam, well, theres always the tape option.”]
Source: https://gizmodo.com/how-to-stop-hackers-from-spying-with-your-webcam-1788203888