gistfile1.txt

// the cell creation logic
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UVLVideoCell *videoCell = (UVLVideoCell *)[collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([UVLVideoCell class]) forIndexPath:indexPath];
    
    NSInteger index = 1 + indexPath.item%2;
    NSURL *sampleURL = [[NSBundle mainBundle] URLForResource:[NSString stringWithFormat:@"flak_0%i", index] withExtension:@"mp4" subdirectory:@"videos"];
    [videoCell loadVideoURL:sampleURL];
    
    return videoCell;
}

// inside the cell
- (void)loadVideoURL:(NSURL *)url
{
    self.gpuMovie = [[GPUImageMovie alloc] initWithURL:url];
    self.gpuMovie.shouldRepeat = YES;
    [self.gpuMovie addTarget:self.gpuView];

    [self.gpuMovie startProcessing];
}

// called when cell goes off-screen
- (void)didEndDisplayingCell
{
    [self.gpuMovie cancelProcessing];
    self.gpuMovie = nil;
}