Is Picture in Picture supported for WebRTC / WebView video on iOS (outside app)?

Hello,

I am implementing video calling on iOS and need to support Picture in Picture (PiP) behavior similar to FaceTime or WhatsApp.

What works

Audio continues correctly in background

• CallKit UI works as expected
• Video works correctly while the app is in the foreground

What I’m trying to achieve

When the user presses the Home button or switches apps, I want to show a system Picture in Picture window (floating video outside the app).

Current setup

Video is rendered via WebRTC

The video is displayed inside a WKWebView (HTML / JavaScript)

• PiP works only while the app is foregrounded
• When the app backgrounds, the video disappears (only audio remains)

Questions

1. Does iOS support system Picture in Picture for:

WebRTC video

WKWebView / HTML video

2 Is AVPictureInPictureController limited only to:

AVPlayerLayer

AVSampleBufferDisplayLayer

3 If PiP requires native rendering:

Is it mandatory to render WebRTC frames natively using AVSampleBufferDisplayLayer?

Is PiP explicitly unsupported for WebView / HTML video?

📌 Clarification

Apps like FaceTime and WhatsApp are able to show PiP outside the app.

I want to understand whether this behavior is achievable only with native video pipelines, or if WebView-based video is fundamentally restricted by iOS.

Any official clarification or documentation reference would be appreciated.

Thank you.