demo · v134

Background Blur Status

videoTrack.getSettings().backgroundBlur and the corresponding capability/constraint expose whether the OS-level background blur is active. Click "start camera" — the page reports what the API returns for the live track.

probing MediaStreamTrack capability...

Try it

capability: ? setting: ? 
{}

The code

const stream = await navigator.mediaDevices.getUserMedia({ video: true });
const track = stream.getVideoTracks()[0];
console.log(track.getCapabilities().backgroundBlur); // [true] / [false] / undefined
console.log(track.getSettings().backgroundBlur);     // true / false / undefined

see also