This error occurs when the application is unable to access the MediaDevices API, which is required for webcam and microphone access.
The most common cause is running the application from an insecure context (not HTTPS or localhost).
Run the application using a local web server with one of these methods:
python -m http.server
or python3 -m http.server
http-server
or live-server
Then access the app via http://localhost:8000
(or whatever port your server uses).
If deploying to a production environment, ensure your site is served over HTTPS.
Some browsers allow you to bypass secure context requirements with special flags, but this is not recommended for security reasons.
The Video Feedback app works best with: