Transforming an Orientation of a video in AV Foundation portrait to display in a landscape setting

I made an editor in a landscape setting but when I import portrait clips onto a timeline they seem not still be sideways. Can anyone help me to get these clips to appear right side up like a square in landscape setting? I must be doing some transformation of the video wrong.

- (UIImageOrientation)getVideoOrientationFromAsset:(AVAssetTrack *)clipVideoTrack
{
CGSize size = [clipVideoTrack naturalSize];
CGAffineTransform txf = [clipVideoTrack preferredTransform];

if (size.width == txf.tx && size.height == txf.ty)
return UIImageOrientationLeft; //return UIInterfaceOrientationLandscapeLeft;
else if (txf.tx == 0 && txf.ty == 0)
return UIImageOrientationRight; //return UIInterfaceOrientationLandscapeRight;
else if (txf.tx == 0 && txf.ty == size.width)
return UIImageOrientationDown; //return UIInterfaceOrientationPortraitUpsideDown;
else
return UIImageOrientationUp; //return UIInterfaceOrientationPortrait;
}

portrait videos returning landscape every time.so it's hard to detect that this is portrait.

I don't this that all portrait videos have this issue.I think these videos are captured in portrait mode but visual representation is in Portrait. Does anyone know how to make this work?