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<!DOCTYPE html>
<html>
<head>
<style>
html, body {
margin: 0;
padding: 0;
}
video {
width: 320px;
height: 240px;
}
#mask {
position: absolute;
z-index: 3;
width: 320px;
height: 200px;
background-color: green;
top: 0;
left: 0;
}
</style>
</head>
<body>
<video id="vid" controls>
<track kind="subtitles" src="foo.vtt" srclang="en">
</video>
<div id="mask"></div>
</body>
</html>