After installing the last MacOS Sierra update, I lost my camera on Facetime and Skype, and in web apps; the name of the camera to be selected simply stops appearing on those apps, it is as if I do not have a camera from their point of view.
I actually had this problem many times in the past, and often a reboot fixed it. However, I rebooted several times, and it did not solve the situation.
I also tried several solutions on forums, including killing the camera daemon without much success.
This issue keeps happening even after the upgrade to High Sierra in my 2013 Macbook Pro 13''. Interestingly enough, it does not happen with my new MacBook Pro 15''
What to do?