JSFiddle - React, Tailwind, and code Playground

HTML

<video id="webcam" width="640" height="480"></video>

<button type="button" onclick="numglGlobalVar.start_pause_button();">Start / Pause</button>

<div>FPS:</div>
<div id="fps"></div>

CSS

video {
   display:none;
}

JavaScript

let numglGlobalVar;

fetch("https://raw.githubusercontent.com/jongomez/numgl/master/src/numgl.js")
  .then((response) => response.text())
  .then((text) => {
  eval(text);
  numglGlobalVar = numgl;
  
  // Show frames per second.
  numgl.set_fps_element("fps");
  var webcamId = numgl.store_webcam("webcam");

  numgl.show_canvas(webcamId);
  numgl.threshold(webcamId, 80);
  numgl.do_it();  
});