.slide:nth-of-type(1) {
background: url(https://static-pss-eu.wgcdn.co/shop/media/carousel/86/1b/861b8481504e45a6a6a5b838286a5239.jpg) no-repeat center;
}
.slide:nth-of-type(2) {
background: url(https://static-pss-eu.wgcdn.co/shop/media/carousel/86/1b/861b8481504e45a6a6a5b838286a5239.jpg) no-repeat center;
}
.slide:nth-of-type(3) {
background: url(https://static-pss-eu.wgcdn.co/shop/media/carousel/86/1b/861b8481504e45a6a6a5b838286a5239.jpg) no-repeat center;
}
.slide:nth-of-type(4) {
background: url(https://static-pss-eu.wgcdn.co/shop/media/carousel/86/1b/861b8481504e45a6a6a5b838286a5239.jpg) no-repeat center;
}
.slide:nth-of-type(5) {
background: url(https://static-pss-eu.wgcdn.co/shop/media/carousel/86/1b/861b8481504e45a6a6a5b838286a5239.jpg) no-repeat center;
}
<video autoplay loop>
<source src="video/video2.mp4" type="video/mp4">
<source src="video/video1.webm" type="video/webm">
<source src="video/video3.ogv" type="video/ogg"/>
</video>
video{
position:fixed;
z-index:-1;
min-width:100%;
min-height:100%;
overflow:hidden;
}