How to Capture Video thumbnail from video URL

Include the Following Framework in project:
AVFoundation.framework
CoreMedia.framework


- (void) CaptureThumnailImageFromVideoURl
{
// NSURL *url = [NSURL URLWithString:@"http://videos.imotors.com/videos/1onONE/1onONE_intro_new.mp4"];
NSURL *url = [NSURL URLWithString:@"http://videos.imotors.com/videos/Top200/Top200_2010_Audi_A8.mp4"];
AVURLAsset *asset=[[AVURLAsset alloc] initWithURL:url options:nil];
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
generator.appliesPreferredTrackTransform=TRUE;
[asset release];
CMTime thumbTime = CMTimeMakeWithSeconds(0,15);
AVAssetImageGeneratorCompletionHandler handler = ^(CMTime requestedTime, CGImageRef img, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error){
if (result != AVAssetImageGeneratorSucceeded) {
NSLog(@"couldn't generate thumbnail, error:%@", error);
}
thumbImageview.image = [UIImage imageWithCGImage: img];
[generator release];
};
CGSize maxSize = CGSizeMake(100, 90); // define the size of image.
generator.maximumSize = maxSize;
[generator generateCGImagesAsynchronouslyForTimes:[NSArray arrayWithObject:[NSValue valueWithCMTime:thumbTime]] completionHandler:handler];
}

Download Video from the URL:

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];

[request setHTTPMethod:@"GET"];

NSError *error;

NSURLResponse *response;

NSString *documentFolderPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

NSFileManager *fileManager = [NSFileManager defaultManager];

NSString *videosFolderPath = [documentFolderPath stringByAppendingPathComponent:@"videos"];

//Check if the videos folder already exists, if not, create it!!!

BOOL isDir;

if (([fileManager fileExistsAtPath:videosFolderPath isDirectory:&isDir] && isDir) == FALSE) {

    [[NSFileManager defaultManager] createDirectoryAtPath:videosFolderPath attributes:nil];

}

NSData *urlData;

NSString *downloadPath = @"http://foo.com/videos/bar.mpeg";

[request setURL:[NSURL URLWithString:downloadPath]];

urlData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

NSString *filePath = [videosFolderPath stringByAppendingPathComponent:@"bar.mpeg"];

BOOL written = [urlData writeToFile:filePath atomically:NO];

if (written)

    NSLog(@"Saved to file: %@", filePath);