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

BrowserCaptureMediaStreamTrack: cropTo() 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 cropTo() method of the BrowserCaptureMediaStreamTrack interface crops a self-capture stream to the area in which a specified DOM element is rendered.

cropTarget

A CropTarget instance representing the element rendering area the stream should be cropped to, or null/undefined, in which case any previously-set cropping 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 crop target element no longer exists.
• The track being cropped is not a track captured from the user's screen.
• cropTarget is not a CropTarget instance, null, or undefined.
• cropTarget was created in a tab other than the one being captured.

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

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

// Create crop target from DOM element
const demoElem = document.querySelector("#demo");
const cropTarget = await CropTarget.fromElement(demoElem);

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

// Crop video track
await track.cropTo(cropTarget);

// Broadcast cropped 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 cropping by making a call to cropTo() on a previously-cropped track, passing an argument of null to it:

// Stop cropping
await track.cropTo(null);

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