I was waiting to report this until both Fusion 8.5 and the Sierra golden master were out, but the problem persists.
I have a Mid 2012 Retina MacBook Pro with a built-in FaceTime HD Camera (UVC Camera VendorID_1452 ProductID_34064).
After I start a virtual machine the camera cannot be turned on by any other application (FaceTime, Photo Booth, Skype). The camera remains unresponsive even after shutting down virtual machines and quitting Fusion, until I reboot the MacBook. If another app is using the camera when I start a Fusion VM, the camera continues to work until I close the other app, then it will not reactivate if I restart the other app.
Has anyone else experienced this? Can anyone suggest a resolution? I'm happy to provide more information if necessary. Thanks!