Nuked 
Picture-In-Picture mode lets you watch a video in a small window while you’re doing other things on your iPhone.
If you tap to pull up playback controls, you should see a picture-in-picture icon in the top-left corner of your screen. The video briefly goes into its own window before returning to its usual spot on YouTube’s site.
Ios 14’s picture-in-picture mode does n’t work with YouTube in Safari. The picture-in-picture mode did n’t work in Safari.
If you have YouTube premium, picture-in-picture works as expected. But it’s not working properly if you’re a free user.
Picture-In-Picture mode still works with YouTube videos in Safari. If you’re using an iPad, regardless of whether you’ve got a free or premium account.
For its own app, YouTube limits the ability to play videos in the background to YouTube premium subscribers. It’s unclear if this is a bug or if YouTube removed the functionality intentionally.
