Video is not playing in ios8 using AVPlayer - objective-c

Question

Video stored in documents directory is not playing if i run app in ios8 but works perfect if i run in ios7
I am downloading video in documents directory using AFNetworking.Here is the code.
NSURLRequest *request = [NSURLRequest requestWithURL:urlVideo];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
NSString *path = [dataPath stringByAppendingPathComponent:[urlVideo lastPathComponent]];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
self.isDownloadingComplete = YES;
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Video Downloading Failed");
}];
[operation start];
And i am playing that downloaded video using AVPlayer. Here is the code.
NSURL* playbackURL = [[NSURL alloc] initFileURLWithPath:strPath isDirectory:NO];
[[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:[_pl currentItem]];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(playerItemDidReachEnd:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:[_pl currentItem]];
AVAsset *asset = [AVURLAsset URLAssetWithURL:playbackURL options:nil];
AVPlayerItem *anItem = [AVPlayerItem playerItemWithAsset:asset];
_pl = [AVPlayer playerWithPlayerItem:anItem];
_pl.volume = 1.0;
_pl.actionAtItemEnd = AVPlayerActionAtItemEndNone;
AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:_pl];
layer.videoGravity = AVLayerVideoGravityResizeAspectFill;
layer.frame = CGRectMake(0, 0, 305, 306);
[self.contentView.layer addSublayer: layer];
[_pl play];
I think issue is with Documents Directory as i run the app, the document path is changing every time, but i am sending correct path every time. Here is reference: http://pinkstone.co.uk/where-is-the-documents-directory-for-the-ios-8-simulator/

Answer 1

I finally solved it by following code
I just replaced
[self.contentView.layer addSublayer: layer];
with
[self.layer addSublayer:layer];
And it is working fine, but still i am not getting what is the problem with [self.contentView.layer addSublayer: layer];
Let me know if anyone have strong proof.
Thanks