JS Canvas Webcam Rainbow Lazers Start/Pause Effect V2 SRC

<center>
<body onmousemove="drawe();" onmousedown="drawe" onmouseup="drawe" ommouseover="drawe" onchange="drawe" onload="drawe" onpaint="drawe" ondoubleclick="drawe;">
<video id="video" autoplay hidden>
</video>
<canvas id="canvas" onchange="drawe;" topmost="false" onchange="drawe;" width="500" height="500" style="opacity:1.0;fillColor:none;">
<script>
  alert('Press Any Key To Pause. And Click Any Place To Resume!!')
var ii=1;
var video = document.getElementById("video");
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var video = document.getElementById('video');
var mediaConfig = { video: true,audio:false};
function drawe(){
var possible = "FABCGDE0123456789";
var text = "";
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
for(var i=0; i!=6; i++)
text+=possible.charAt(Math.floor(Math.random()*possible.length))
ctx.strokeStyle="#"+text;
ctx.moveTo(Math.random()*event.x+Math.random()*500,event.x+Math.random()*500);
ctx.lineTo(Math.random()*event.y*Math.random()*50,event.y+Math.random()*500);
ctx.topmost=false;

ctx.stroke();
text='';
}
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
if(ctx.width==500){event.mouseMove++;}
video.src = this.window.URL.createObjectURL(stream);
    var store =video.src;
video.play();
video.addEventListener("play", function() {i = window.setInterval(function() {
canvas.style.opacity-=0.1
canvas.style.opacity++;
  ctx.topmost=false;
ctx.drawImage(video,1,1,500,500)},24);
ctx.draw();
drawe;
}, false);
  window.onkeydown=function(){
    this.video.src=('');
    this.video.pause();
    alert('Click Any Place To Restart Webcam/Effect!!')

  }
    window.onclick=function(){
   this.video.src=(store);
    this.video.play();

  }
});
</script>