Video Playback dispose problem

Hi Support,

I have one silly problem which I don't seem to be able to find an answer for! it seems like a very easy thing that I have missed... here I explain:

for you guys to better understand the problem, I just created a sample project, as soon as you open the sample app, camera starts, now, try to pull down the notification bar on your iPhone once or hit the iPhone button so the app would go to background.... now, push away the notification bar and the app will be activated again and the camera shows... all good till here. but now, as soon as you pull down the notification bar again to take the app to the background or better to say, to dispose the AR and camera, the app suddenly crashes and closes!

I'm sure there's something about disposing the library that I am doing wrong! that would be super helpful if you guys can have a quick look at the project and tell me where could be the problem? or if you may be so kind to fix the project and send it back, I would be super happy and would really appriciate :)

http://myflashlab.com/VideoPlaybackDisposeIssue.zip

I created this little sample out of the main project we're working on. if you could help me fix it with the minimal changes in the layout, that would be awsome. (I'm not too good with Obj-C)

Thanks you so much in advance