Media capture
Media capture allows apps to use the camera and microphone of a device. After recording a video you can play it, download it or record another one.
On iOS, you may need to enable MediaRecorder in:
Settings > Safari > Advanced > Experimental Features > MediaRecorder
Demo
Click the "+" button to start your web cam. You can then record a video, play it and download it.
You can check the "Automatic Picture-in-Picture" box to enable automatic Picture-in-Picture when you focus another browser tab.
Documentation
Automatic picture-in-picture on Chrome Developers
Browser support
Automatic Picture-in-Picture is supported in Chromium-based browsers.