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NSString *embedHTML = @"<html><head><style type="text/css">body {background-color:transparent;color: white;}</style><script>function load({document.getElementById("yt").play();}</script></head><body onload="load()"style="margin:0"><video id="yt" src="%@" width="%0.0f" height="%0.0f" autoplay controls></video></body></html>";
NSString *html = [NSString stringWithFormat:embedHTML, urlString, videoView.frame.size.width, videoView.frame.size.height,thumbnailImageLink];
[videoView loadHTMLString:html baseURL:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(videoPlayStarted:) name:@"UIMoviePlayerControllerDidEnterFullscreenNotification" object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(videoPlayFinished:) name:@"UIMoviePlayerControllerDidExitFullscreenNotification" object:nil];

BOOL isVideoInFullScreenMode;
-(void)videoPlayStarted:(NSNotification *)notification{
//Your stuff here
   isVideoInFullScreenMode = YES;
}

-(void)videoPlayFinished:(NSNotification *)notification{
    //Your stuffs here
    isVideoInFullScreenMode = NO;
}