#import <AVFoundation/AVFoundation.h>

 - (UIImage *)thumbnailImageForVideo:(NSURL *)videoURL atTime:(NSTimeInterval)time {

     AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoURL options:nil];

     NSParameterAssert(asset);

     AVAssetImageGenerator *assetImageGenerator =[[AVAssetImageGenerator alloc] initWithAsset:asset];

     assetImageGenerator.appliesPreferredTrackTransform = YES;

     assetImageGenerator.apertureMode =AVAssetImageGeneratorApertureModeEncodedPixels;

     CGImageRef thumbnailImageRef = NULL;

     CFTimeInterval thumbnailImageTime = time;

     NSError *thumbnailImageGenerationError = nil;

     thumbnailImageRef = [assetImageGenerator copyCGImageAtTime:CMTimeMake(thumbnailImageTime, )actualTime:NULL error:&thumbnailImageGenerationError];

     if(!thumbnailImageRef)

         CXIMLog(@"thumbnailImageGenerationError %@",thumbnailImageGenerationError);

     UIImage *thumbnailImage = thumbnailImageRef ? [[UIImage alloc]initWithCGImage:thumbnailImageRef] : nil;

     return thumbnailImage;

 }

 #import <MediaPlayer/MediaPlayer.h>

 MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];

 moviePlayer.shouldAutoplay = NO;

 UIImage *thumbnailImage = [moviePlayer thumbnailImageAtTime:time timeOption:MPMovieTimeOptionNearestKeyFrame];