How to display a certain view from layout in Picture in Picture mod in android?

I am trying to implement pip mode in android. There is a LiveStreamActivity which contains these elements: Header layout, VideoStream layout and custom popup that I show programatically. Their contexts are the same: LiveStreamActivity. When I enter pip mode LiveStreamActivity's root layout shrinks and fits in small pip screen. But I only want to show VideoStream layout.

I tried setSourceRectHint to achieve this but it does not work. Summary : How to show desired view (or views) in pip mode?

override fun onUserLeaveHint() {

            val visibleRect = Rect()
            mBinding.videoStreamLayout.getGlobalVisibleRect(visibleRect)

            enterPictureInPictureMode(PictureInPictureParams.Builder()
                .setAspectRatio(Rational(9,16))
                .setAutoEnterEnabled(true)
                .setSourceRectHint(visibleRect)
                .setSeamlessResizeEnabled(false)
                .build())
        

        super.onUserLeaveHint()
    }