Video Settings RingCentral Meetings Issue

I'm unable to get my built-in webcam working during a meeting on my MacBook. When I go to Video Settings, the only option I have is FaceTime HD Camera. My Macbook webcam never turns on. I've been unable to find any insights within help, support forums or within system settings. I don't have this issue with Google Hangout, GoToMeeting, etc. Please advise.