macbook retina early 2016 photobooth not working

my macbook's camera has not been working for like 2 years from now, it just disconnects from photo booth when i try it, before it works when i restart the macbook it works and photobooth returns to normal, but in the recently (last year) it couldn't work even if i restarted or performed SMC or did the terminal and the activity monitor restarts and checks and it still doesn't work, i don't know if this means that they would have to service my mac or does it mean that i just have crashed my mac's camera, PLZ if anyone could help me please send the correct way of turning on the camera.