【Creating a recorder with Document Picture-in-Picture API | Contrast】
Document Picture-in-Picture APIを使って、カメラ表示と画面を合成して録画する方法について
https://realtime.jser.info/2023/08/11/creating-a-recorder-with-document-picture-in-picture-api-contrast/

Contrast
Creating a recorder with Document Picture-in-Picture API
This article describes how to leverage the Document Picture-in-Picture API and Insertable Streams to develop a simple screen and camera recorder.





