Blur Image Reveal Part - Graphic Tree

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Blur Image Reveal Part </title>
	<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
	<style>
    body {
    margin:0;
}
.pic {
    text-align: center;
    position: relative;
    height:600px;
}
.blur {
    height: 100%;
}
.overlay {
    position: absolute;
    top: 0px;
    left: 0px;
    height: 100%;
}
    </style>
</head>
<body>
	<div class="pic">
    <svg class="blur" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100%">
        <image filter="url(#filter2)" xlink:href="https://images.pexels.com/photos/249798/pexels-photo-249798.png" width="100%" height="100%"></image>
        <filter id="filter2">
            <fegaussianblur stdDeviation="5" />
        </filter>
        <mask id="mask1">
            <circle cx="-50%" cy="-50%" r="80" fill="white" filter="url(#filter2)" />
        </mask>
        <image xlink:href="https://images.pexels.com/photos/249798/pexels-photo-249798.png" width="100%" height="100%" mask="url(#mask1)"></image>
    </svg>
</div>
	<script>
    
$('.pic').mousemove(function (event) {
    event.preventDefault();
    var upX = event.clientX;
    var upY = event.clientY;
    var mask = $('#mask1 circle')[0];
    mask.setAttribute("cy", (upY - 5) + 'px');
    mask.setAttribute("cx", (upX) + 'px');
});    
    
    </script>
</body>
</html>
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