You can use picture-in-picture on videos played directly from the
app if you have a
subscription which is currently available in some countries. Check the
website for availability in your country.
If you have a regular
YouTube subscription, you can use picture-in-picture when playing
YouTube videos from the
Google Chrome™ browser.
YouTube and sign in to your account.
, and then select
Play a video in full screen, and then tap press HOME to minimize the video to a small window on the screen.