PiP iPhone 16pro canada
PiP is enabled but still can’t swipe up and view other apps at the same time
iPhone 16 Pro, iOS 18
If your video player app (Let us say YouTube, You forgot to mention the name of the app) doesn’t support PiP, then you may have to wait for the developer to update the app compatible with PiP.
Alternatively, you may go to youtube.com in Safari, play a video, and make it full-screen (You may have to disable YouTube Player). Now you can select the newly-added PiP button on an iPhone, and the video will pop out from the page. You can change tabs or navigate to different apps, and the video will keep running in the PIP.
See the pic below, a snapshot was taken on iPhone SE 1st Gen long ago.