Crear cuenta
<!doctype html>
<html>
<head>
<meta name="viewport" content="width=device-width">
<title>video background</title>
<style>
body {margin: 0;padding: 0;}#video {
position: fixed;left: 0;top: 0;min-width: 100%;
min-height: 100%;
width: auto;height: auto;z-index: -10;
visibility: visible;}</style>
</head>
<body>
<video id="video" loop autoplay poster="poster.jpg" onload="this.play()">
<source src="video.mp4" type="video/mp4" />
<source src="video.ogv" type="video/ogg" />
<source src="video.webm" type="video/webm" />
</video>
</body>
</html>
<!doctype html>
<html>
<head>
<meta name="viewport" content="width=device-width">
<title>video background</title>
<style>
* {
margin: 0;padding: 0;border: 0;}#video {
position: absolute;top: 0;left: 0;right: 0;bottom: 0;margin: auto;max-width: 100%;
max-height: 100%;
z-index: -4;
</style>
</head>
<body>
<video id="video" loop autoplay poster="poster.jpg" onload="this.play()">
<source src="video.mp4" type="video/mp4" />
<source src="video.ogv" type="video/ogg" />
<source src="video.webm" type="video/webm" />
</video>
</body>
</html>