[Desktop]Camera turns black and stops when trying to record a video

[Victor gonzalez]

Enviroment: Desktop running unity8 on 16.10
            HW: intel graphics+intel processor

Steps to reproduce:

1º Open camera app
2º Change to video mode and press record button
3º Check the screen turns black and no video is recorded

Current result: When pressing record button camera screen turns black and is not possible to record a video. Then is not either possible take a photo again, the screen remains black and camera app unresponsive
Expected result: Camera app should record video and no issues should appear when video stops recording

Reproducibility 100%

Add info: error found in camera logs.

file:///usr/share/camera-app/BottomEdgeIndicators.qml:88:27: Unable to assign [undefined] to QString
file:///usr/share/camera-app/ViewFinderView.qml:459: TypeError: Cannot read property 'contentType' of null
file:///usr/share/camera-app/OptionButton.qml:26: TypeError: Cannot read property 'icon' of undefined
file:///usr/share/camera-app/OptionButton.qml:26: TypeError: Cannot read property 'icon' of undefined
file:///usr/share/camera-app/OptionButton.qml:26: TypeError: Cannot read property 'icon' of undefined
file:///usr/share/camera-app/OptionButton.qml:26: TypeError: Cannot read property 'icon' of undefined
CameraBin error: "Device '/dev/video0' is busy"
CameraBin error: "Internal data flow error.
** (camera-app:31429): CRITICAL **: No headers or buffers on pad muxer:video_665455659