Steps to reproduce

1. Configure a Logitech C270 webcam on a Control Hub
2. Run the WebcamExample OpMode
3. Disconnect the webcam
   1. The video display on the RC freezes
   2. If you stop the OpMode at this point, it will stop cleanly
4. Reconnect the webcam
   1. The video display stays frozen
5. The app may hang at this point all by itself, in which case the Control Hub OS watchdog present in OS 1.1.2 and later will restart it. Otherwise, the app will hang when you try to stop the Op Mode, with the same result.

Disconnecting and reconnecting a webcam works correctly when running an OpMode that uses the webcam from Vuforia.