GPUImage + Get Blank Video as output of video file overlay - ios

Question

I am using GPUImage framework and it is so good. In my app, i have record video and then add overlay on recorder video. (due to my requirement.)
Step 1: recording video is working fine and i am getting correct video.
Step 2: Add overlay on video file, here i am getting issue and get black video as output with small size.
My code is as below:
self.movieFile = [[GPUImageMovie alloc] initWithURL:capturevideoURL];
self.movieFile.delegate = self;
self.movieFile.runBenchmark = YES;
self.movieFile.playAtActualSpeed = YES;
[self.movieFile addTarget:self.filter];
UIImage *inputImage = self.overlayImage;
GPUImagePicture *overlayPicture = [[GPUImagePicture alloc] initWithImage:inputImage];
[overlayPicture addTarget:self.filter];
[overlayPicture processImage];
// Only rotate the video for display, leave orientation the same for recording
GPUImageView *filterView = (GPUImageView *)self.view;
[self.filter addTarget:filterView];
[CommonFunction DeleteFileFromApp:#"Movie.m4v"];
NSString *pathToMovie = [CommonFunction GetPathForFileName:#"Movie.m4v"];
unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];
self.movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(320.0, 480.0)];
[self.filter addTarget:self.movieWriter];
// Configure this for video from the movie file, where we want to preserve all video frames and audio samples
self.movieWriter.shouldPassthroughAudio = YES;
self.movieFile.audioEncodingTarget = self.movieWriter;
[self.movieFile enableSynchronizedEncodingUsingMovieWriter:self.movieWriter];
[self.movieWriter startRecording];
[self.movieFile startProcessing];
NSLog(#"Start Overlaying...");
__weak GPUImageNormalBlendFilter *filterlocal = self.filter;
__weak GPUImageMovieWriter *moviewriterlocal = self.movieWriter;
__weak typeof(self) weakSelf = self;
[movieWriter setCompletionBlock:^{
[filterlocal removeTarget:moviewriterlocal];
[moviewriterlocal finishRecording];
[weakSelf loadVideo];
}];
Can you suggest me, how to solve this issue of black video output?
Thanks