With the newly released iOS 14 update, Picture in Picture functionality is FINALLY available for the iPhone letting users do things like watch videos and take FaceTime calls while doing other things on their device. Picture in Picture works with apps that play video content, but when it comes to third-party apps, app developers have to implement support for the feature and so initial launch support might be limited right now. You can also use it for YouTube with a slight workaround.
read more -
https://www.macrumors.com/guide/picture-in-picture/
