As I can't find a way to get the controls for video working with Unity 4.6.5 and Vuforia 4.2.3 I have switched to looking at playing the videos in full screen instead.
In VideoPlayerHelper.cs I have edited line 219 to:
return videoPlayerPlay(true, seekPosition);
so that it automatically plays the video in full screen when triggered.
The problem occurs when the video either starts to play fullscreeen in either portrait or landscape mode and I tap on the Back option while the video is running, the screen goes black and the video starts to play from the beginning, but there is only audio (still a black screen) and even when I exit the Unity scene the AR is in, the video audio still keeps on playing.
If I leave the video running until the end, the same thing happens as well. It goes back to a black screen and then play the video audio, but there is not image.
When testing this out, I am only poiting the device at the marker to trigger the first instance, after that I am no longer pointing at the marker so it isn't triggering again from seeing the marker.
I'm testing on an iPhone 5 at the moment.
Any help or insight into why this is happening would be very much appreciated.