How to manage the image asynchronously from a UIImagePicker

// How to manage the image asynchronously from a UIImagePickerController
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
        // hide UIImagePickerController
        [picker dismissViewControllerAnimated:YES completion:^{
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC), dispatch_get_current_queue(), ^{
                dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
                    UIImage *originalImage = [info objectForKey:UIImagePickerControllerOriginalImage];

                    if (photo) {

                        // TODO: you code here....
                    }
                });
            });
        }];
}