Webcam API

The Webcam API is the channel that lets a browser pull in camera video without installing any app. In the past, showing camera footage on screen meant installing dedicated software that talked to the camera driver directly. Thanks to the Webcam API, all you have to do now is visit a website and grant permission, and the browser brings the camera feed straight into the page.

Think of it like this: in the past, if a guest wanted to see your home CCTV footage, you'd need to hook up a separate monitor and cables. Now, you just press the doorbell and the video shows up right on your smartphone screen. The Webcam API plays the role of that doorbell — a set of rules that hands camera video data over in a form the webpage can use.

Combine this incoming video with recognition technology that reads hand shapes or facial expressions, and you can build webpages where waving a hand alone makes sound or draws pictures — turning the camera itself into a controller.

The article describes a browser-based theremin instrument, saying it has "reached the point where the same experience can be recreated using nothing but the browser's Webcam API and a hand-tracking model." Here, the Webcam API doesn't refer to the camera hardware itself or to video-conferencing features — it means the connection rules that let the browser pass camera video into webpage code.

1. On a laptop or device with a webcam, visit a webpage that requests camera access (e.g., a browser-based video call service or a webcam filter site).
2. Check whether the browser pops up a prompt asking for camera permission, and try clicking allow.
3. After granting permission, see whether the camera feed appears directly on screen without installing any separate program.
4. Check your browser's settings menu to see if you can later revoke the camera permission you granted to a specific site.