Combine images and videos to make a complete movie - ios

Question

I had done for merging array of images to video.....Can anyone help me to make a movie using array of images and video.
Here I added the code for making array of image to video
NSError *error = nil;
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSString *documentsDirectory = [NSHomeDirectory()
stringByAppendingPathComponent:#"Documents"];
NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:#"Montage-Videos.mp4"];
if ([fileMgr fileExistsAtPath:videoOutputPath])
[fileMgr removeItemAtPath:videoOutputPath error:&error];
{
UIImage * img;
imageArray = [[NSMutableArray alloc]init];
videoURLArray = [[NSMutableArray alloc]init];
for (int i=0; i<[randomArray count]; i++) {
AVAsset *asset = [AVAsset assetWithURL:[randomArray objectAtIndex:i]];
if ([[randomArray objectAtIndex:i] isKindOfClass:[NSURL class]]) {
// Here I need to add video to the array for making video.
}
else{
img = [randomArray objectAtIndex:i];
[imageArray addObject:img];
}
}
UIImage *image ;
for (int i=0; i<[imageArray count]; i++) {
image = [imageArray objectAtIndex:0];
}
if ([imageArray count]>0) {
dispatch_queue_t queue = dispatch_queue_create("com.example.MyQueue", DISPATCH_QUEUE_SERIAL);
dispatch_sync(queue, ^{
[self writeImagesToMovieAtPath:videoOutputPath withSize:CGSizeMake(374, 456) withImage:image];
});
}
}
}