Apple has recently published a post warning the owners of Mac not to close their laptop with a camera cover attached. They have warned that this practice will have the risk of getting the crack on display. On their post that has stated that the clearance between the display and keyword is very tight as they are designed to be a good fit.
Camera covering is becoming popular nowadays which comes with a sliding mechanism. But one should be very careful not to close the screen when the cover is still on else if by chance screen gets cracked then it is going to cost a good fortune even with apple care plus it is going to be cheap while mending it.
Apple also has assured its users that they could trust the green LED beside the camera of Mac. They claimed that “The camera is engineered so that it can’t activate without the camera indicator light also turning on.” However, if you are one of those skeptic users which is over conscious about privacy, you could use a thin tape to close the camera if you do not trust the blinking of the LED light. Still, you have to be careful about tape will not leave any residue behind on regular use.
Also, you can always check which applications have access to your laptop camera. For this, you can go the preferences > security and privacy and inside the camera section you can change the permission of the camera access.