Pause video at 15th second

gistfile1.m

        __weak FePreviewVideoViewController *weakSelf = self;
        timeObserver = [_player addPeriodicTimeObserverForInterval:CMTimeMake(15, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time)
                       {
                           typeof(self) strongSelf = weakSelf;
                           
                           CGFloat currentTime = CMTimeGetSeconds(time);
                           
                           if (currentTime >= 15)
                           {
                                [strongSelf.player pause];
                                
                                // Remove O
                                [strongSelf.player removeTimeObserver:timeObserver];
                                 timeObserver = nil;
                           }
                           
                           
                       }];