After reading about how hackers have taken control of a MacBook's iSight camera to spy on the person sitting in front of it, you might start to get a feeling that someone is watching you... Making matters worse, hackers have been able to spy on people without triggering the little green light that tells you your iSight camera is active...
...monitor your iSight camera so you know when it's being used. MacOS doesn't let you do this natively, so you'll need to turn to a third-party app: OverSight.
OverSight is a free app that installs quickly and places an icon in your menu bar to let you know it's running. more Other security apps from the same developer.