Videos: Player behind photo viewer when in fullscreen mode

[graciousgrey]

Steps to reproduce:

1. Open video in photo viewer
2. Click fullscreen button from within the photo viewer
3. Click the button next to the title
   

Current behaviour:
I hear the video playing but I see only the preview thumbnail

Expected behaviour:
I see the video playing

Note:
Playing videos in fullscreen does work when using another way (Click Play and then the fullscreen button in the lower right corner)