PIP (Picture in Picture) window on iPhone closes when leaving the demo app

[onasipim]

1. What's need to be changed in configuration so that the demo app to keep showing the PIP window, even when the demo app is put to background? Usually other apps using the AVPlayer framework keep showing the PIP window. I set the audio session category to Playback in the settings.
2. How to enable scrubbing, moving the timeline with gestures when the device is in the locked state in the demo app?

Thanks