Video in installed Progressive Web Apps (PWAs) will enter and exit picture-in-picture automatically when a document's visibility changes. Web apps for video meetings will benefit by allowing picture-in-picture when users switch back and forth between web apps and other applications or tabs. This is currently not possible because a user gesture is required to enter picture-in-picture.
Docs: https://developers.google.com/web/updates/2019/02/chrome-73-media-updates#auto-pip https://github.com/WICG/picture-in-picture/issues/111
Samples: https://googlechrome.github.io/samples/auto-picture-in-picture/