РазДваОригинал ответа на stackoverflow<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="http://i.imgur.com/IGKVr8r.png" width="100%" height="100%"></image>
<filter id="filter2">
<feGaussianBlur stdDeviation="5" />
</filter>
<mask id="mask1">
<circle cx="-50%" cy="-50%" r="30" fill="white" filter="url(#filter2)" />
</mask>
<image xlink:href="http://i.imgur.com/IGKVr8r.png" width="100%" height="100%" mask="url(#mask1)"></image>
</svg>
</div>
body {
margin: 0;
}
.pic {
text-align: center;
position: relative;
height: 250px;
}
.blur {
height: 100%;
}
.overlay {
position: absolute;
top: 0px;
left: 0px;
height: 100%;
}
$('.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');
});