I think you have used UIImagePickerController to open the photo album (mediaType will be kUTTypeMovie)
Use the below UIImagePickerController delegate to get the videoUrl and Its thumbnail
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSURL *videoURL = [info valueForKey:UIImagePickerControllerReferenceURL];
UIImage *videoThumbnail = [info valueForKey:UIImagePickerControllerOriginalImage];
You can save the videoURL and retrieve the Video later using ALAsset_Class or even you can set the url to moviePlayer. [moviePlayer setContentURL:movieURL];
You can use the videoThumbnail to deal with UiImages
Finally, do a Google search to Share video to Facebook.