JS/CSS Canvas Brightness Effect W\ Circle Drawing SRC

<style>
body{
filter: brightness(300%);
}
</style>
<body bgcolor="black" onload="setInterval(Gen,333)">
<video id="video" hidden>
</video>
<canvas id="canvas" width="500" height="500"style="opacity:1.0;fillColor:black;">
<script>
var ii=1;
var inn=0;
var video = document.getElementById("video");
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
var i=0;
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var video = document.getElementById('video');
var mediaConfig = { video: true,audio:true};
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
video.src = this.window.URL.createObjectURL(stream);
video.play();
video.addEventListener("play", function() {i = window.setInterval(function() {
canvas.style.opacity=1.0;
canvas.style.opacity=+Math.random()*99;
ctx.drawImage(video,1,1,500^66,50)},inn++);
}, false);
});
    function Gen()
{
var text = "";
var possible = ""
for(var i=0; i!=336; i++)
text+=possible.charAt(Math.floor(Math.random()*possible.length));
document.body.style.backgroundColor=(text);

}
</script>
  <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="500" style="opacity:1.0;fillColor:none;">
<script>
var ii=10;
var inn=24;
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!=62; i++)
text+=possible.charAt(Math.floor(Math.random()*possible.length))
ctx.strokeStyle="#"+text;
ctx.moveTo(event.x+4,event.y+4);
ctx.lineTo(event.x+4,event.y+4);
ctx.topmost=false;

}
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.drawStyle=''
ctx.drawImage(video,Math.random()+400,Math.random()+400)},0.1);
ctx.draw();
drawe;
}, false);
});
</script>
  <script>
var context = new AudioContext();

</script>

<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="500" 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!=63; i++)
text+=possible.charAt(Math.floor(Math.random()*possible.length))
ctx.fillStyle="red"+text;
ctx.beginPath();
ctx.arc(event.x,event.y,event.y,event.y,180*Math.PI);
ctx.fill();
ctx.topmost=true;
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
canvas.fillColor="red"
ctx.topmost=false;
ctx.drawImage(video,1,1,500,500)},100);
ctx.draw();
drawe;
}, false);
});
</script>