JSFiddle - React, Tailwind, and code Playground

HTML

<video id="video" width="400" height="300" controls autoplay></video>

CSS

video { border: 2px solid gray; margin: 1em; }

JavaScript

var video = document.querySelector( 'video' );

navigator.webkitGetUserMedia({ video: true, audio: true }, function ( stream ) {
    video.src = window.webkitURL.createObjectURL( stream );
}, function ( err ) {
    console.log( 'error: ', err );
});