Where to allow access of camera for my apps???

I’m using Microsoft teams for classes and i need to video call. On the app It showed how video sharing is disabled by administrator. But my camera of my mac is working very well. My friend has a 10.14.6 and he fixed this problem by going into settings> Security& privacy> privacy> and checked the app under ‘camera’ in the list under privacy.

However, I tried the same thing and couldn’t see ‘camera’. My mac is a OS El Capitaine 10.11.6, how do I allow access of camera for my apps then??