JS Canvas Cam Draw Custom Red Blood Text W Start/Stop SRC

<center>
<body bgcolor="black">
<video id="video" autoplay hidden>
</video>
<canvas id="canvas" width="500" height="500"style="opacity:1.0;fillColor:white;fillColor:red;">
<script>
var ii=1;
var inn=prompt('Enter Your Name:');
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:false};
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
ctx.strokeStyle='red';
ctx.fillStyle='red';
//ctx.strokeText(''+inn,219, 51, 295, 195);
video.src = this.window.URL.createObjectURL(stream);
var stream=video.src;
video.play();
video.addEventListener("play", function() {i = window.setInterval(function() {
ctx.fillText(''+inn,Math.random()*500, Math.random()*500, 295, Math.random()*195);
//canvas.style.opacity=0.4;
canvas.style.color='red'
ctx.drawImage(video,ii,ii,500,777)},205);})
this.window.onkeydown=function(){
video.src='';
video.pause;
}
this.window.onkeyup=function(){
video.src=stream;
video.play();
}
});
</script>