Plyr.io Bookmarklet - Replace built in Browser video player with Plyr.io

Plyr.io.js

(function() {
  var css = document.createElement("link");
  css.rel = "stylesheet";
  css.href = "https://cdn.plyr.io/3.7.3/plyr.css";
  document.body.appendChild(css);
  var scr = document.createElement("script");
  scr.src = "https://cdn.plyr.io/3.7.3/plyr.js";
  scr.onload = function() {
    document.querySelectorAll("video").forEach(function(v) {
      var player = new Plyr(v);
    });
  };
  document.body.appendChild(scr);
})();