Can anybody explain why I am getting no data from the video?
Sure, here's your mistake:
NSString *myString = [self.movieURL absoluteString];
should be path
NSString *myString = [self.movieURL path];
NSData *videoData = [NSData dataWithContentsOfFile:myString];
NSLog(@"%@",[NSByteCountFormatter stringFromByteCount:videoData.length countStyle:NSByteCountFormatterCountStyleFile]);