[TIMOB-3027] iOS Bug: Titanium.Media.createVideoPlayer Crash

If you put a VideoPlayer in a window on a tab, switch tabs while the video is playing, and then come back to the first tab, the app crashes.

var tabGroup = Titanium.UI.createTabGroup();

var win = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});
var tab1 = Titanium.UI.createTab({  
    icon:'KS_nav_views.png',
    title:'Tab 1',
    window:win
});

var videoContent = Titanium.Media.createVideoPlayer({
        url: 'movie.mp4',
        backgroundColor:'#111',
        movieControlMode:Titanium.Media.VIDEO_CONTROL_DEFAULT,
        scalingMode:Titanium.Media.VIDEO_SCALING_MODE_FILL
    });

win.add(videoContent);

var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    backgroundColor:'#fff'
});
var tab2 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 2',
    window:win2
});

var label2 = Titanium.UI.createLabel({
  color:'#999',
  text:'I am Window 2',
  font:{fontSize:20,fontFamily:'Helvetica Neue'},
  textAlign:'center',
  width:'auto'
});

win2.add(label2);

tabGroup.addTab(tab1);  
tabGroup.addTab(tab2);  
tabGroup.open();