JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Display Webcam Stream</title>
</head>
<body>
  <div id="container">
    <video autoplay="true" id="videoElement"></video>
  </div>
</body>
</html>

CSS

#container {
	margin: 0px auto;
	width: 500px;
	height: 375px;
	border: 10px #333 solid;
}
#videoElement {
	width: 500px;
	height: 375px;
	background-color: #666;
}

JavaScript

var video = document.querySelector("#videoElement");

if (navigator.mediaDevices.getUserMedia) {
  navigator.mediaDevices.getUserMedia({ video: true })
    .then(function (stream) {
      video.srcObject = stream;
    })
    .catch(function (err0r) {
      console.log("Something went wrong!");
    });
}