Iphone Rotate video within current frame

Hi I am having a video of width = 720 height = 1280

So video is in Portait mode.

I want the video to be rotate by 90 Degree. BUT want the rotated video inside the same size of video that is 720,1280. Yes video will be scaled , but i need this type of rotation .

Please check Image before and after :

This is mine code :

 CGAffineTransform rotationTransform =  CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(90.0));
    CGAffineTransform rotateTranslate =   CGAffineTransformTranslate(rotationTransform,400,320);
    [layerInst setTransform:rotateTranslate atTime:kCMTimeZero];

You can use scaling, rotation and translation transform together and concat each transform to original asset transform. Please try below code for your question

        // here assetTransform is your AVAssetTrack preferred transform
        CGAffineTransform defaultTransfrom = assetTransform;
        // rotate 90 degree
        CGAffineTransform rotateTransform = CGAffineTransformMakeRotation( M_PI_2);
        //get scale factor of resized video
        float scaleFactor = videoSize.width/videoSize.height;
        CGAffineTransform scaleTransform = CGAffineTransformMakeScale(scaleFactor,scaleFactor);
        // get blank Space At Bottom after rotation and scaling
        float blankSpaceAtBottom = (videoSize.height-scaleFactor*videoSize.width);
        //increase y translation according to scaling factor
        float ytranslation = blankSpaceAtBottom/2/scaleFactor;
        CGAffineTransform translationTransform = CGAffineTransformMakeTranslation(videoSize.height,ytranslation);
        //concat all transform
        CGAffineTransform finalTransform = CGAffineTransformConcat(CGAffineTransformConcat(defaultTransfrom,rotateTransform),translationTransform);
       finalTransform = CGAffineTransformConcat(finalTransform,scaleTransform);
        //apply final transform to layer instruction
        [layerInstruction setTransform:finalTransform atTime:kCMTimeZero];

Please let me know if you need more clarification.