JS Quater Of A Rainbow Splatter Circle FX SRC

<center>
<body onmousemove="setInterval(drawe,10)" bgcolor="black">
<video id="video" autoplay hidden>
</video>
<canvas id="canvas" width="500" height="500" style="drawColor:#FFFFFF">
<script>
  var inn=prompt("Enter Text:")
var video = document.getElementById("video");
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");

var mediaConfig = { video:true,audio:false};
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
video.src = this.window.URL.createObjectURL(stream);
video.play();
  video.addEventListener("play", function() {i = window.setInterval(function() {
ctx.drawImage(video,i++,i++,i++,i++)},10);
ctx.topmost=false;
ctx.fill();
}, false);
});

var i=500;
function drawe(){
i++;
var text = "";
var possible = "FABCGDE0123456789";
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.font="23px Sans Serif";
ctx.fillStyle="#"+text;
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
ctx.beginPath();

ctx.fillText(""+inn,Math.random()*i+90,Math.random()*i+90,Math.random()*i++,i++,i++);
 ctx.rotate(180%Math.PI*2)
 ctx.draw();
text='';
}
</script>