JS/CSS Canvas Webcam Grayscale Atom Bomb SRC

<style>
body{
filter: grayscale(100%);

}
</style>

<center>
<body bgcolor="black" onmousemove="drawe();" onmousedown="drawe" onchange="drawe" ondoubkeclick="drawe;">
<video id="video" autoplay hidden>
</video>
<canvas id="canvas" onchange="drawe;" topmost=false onchange="drawe;" width="500" height="234" style="opacity:1.0;fillColor:none;">
<script>
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:0};
function drawe(){
var possible = "FABCGDE0123456789";
var text = "";
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
for(var i=0; i!=3; i++)
text+=possible.charAt(Math.floor(Math.random()*possible.length))
ctx.fillStyle="#"+text;
ctx.beginPath();
ctx.arc(332,234,event.x,event.y,Math.PI*180);
//alert(event.x+":"+event.y);
ctx.fill();
ctx.topmost=0;
ctx.stroke();
text='';
}
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
if(ctx.width==500){event.mouseMove++;}
video.src = this.window.URL.createObjectURL(stream);
video.play();
video.addEventListener("play", function() {i = window.setInterval(function() {
canvas.style.opacity=1.0
ctx.topmost=false;
ctx.drawImage(video,1,1,1000,1000)},1420);
ctx.draw();
drawe;
}, 7);
});
</script>