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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/BrowserCaptureMediaStreamTrack/restrictTo below:

BrowserCaptureMediaStreamTrack: restrictTo() method - Web APIs

Limited availability

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The restrictTo() method of the BrowserCaptureMediaStreamTrack interface restricts a self-capture stream to a specific DOM element (and its descendants).

restrictTo(restrictionTarget)

restrictionTarget

A RestrictionTarget instance representing the element the stream should be restricted to, or null/undefined, in which case any previously-set restriction is removed from the track.

A Promise that resolves to undefined.

The promise will reject if:

• The track kind is not "video", or its readyState is not "live".
• The restriction target element no longer exists.
• The track being restricted is not a track captured from the user's screen.
• restrictionTarget is not a RestrictionTarget instance, null, or undefined.
• restrictionTarget was created in a tab other than the one being captured.

Note: In Chromium, if a track has clones, restrictTo() will reject (see Chrome issue 41482026).

// Options for getDisplayMedia()
const displayMediaOptions = {
  preferCurrentTab: true,
};

// Create restriction target from DOM element
const demoElem = document.querySelector("#demo");
const restrictionTarget = await RestrictionTarget.fromElement(demoElem);

// Capture video stream from user's webcam and isolate video track
const stream =
  await navigator.mediaDevices.getDisplayMedia(displayMediaOptions);
const [track] = stream.getVideoTracks();

// Restrict video track
await track.restrictTo(restrictionTarget);

// Broadcast restricted stream in <video> element
videoElem.srcObject = stream;

See Using the Element Capture and Region Capture APIs for in-context example code.

You can stop the restriction by making a call to restrictTo() on the same track, passing an argument of null to it:

// Stop restricting
await track.restrictTo(null);

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