可通过mix-blend-mode: screen来实现，效果如下：
完整代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<style>
.box{
width: 700px;
height: 500px;
position: relative;
}
video,
i {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
i{
display: block;
font-size: 200px;
font-weight: 700;
line-height: 500px;
text-align: center;
background: white;
mix-blend-mode: screen;
}
</style>
</head>
<body>
<div class="box">
<video autoplay muted loop preload>
<source src="//repo.bfw.wiki/bfwrepo/video/62269e88bd1f1.mp4" />
</video>
<i>BFW</i>
</div>
</body>
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