Video as background parallax CSS

Question

I'm more backend guy than frontend, so if you consider my question as dummy, sorry for that, but I couldn't find answer :)

My aim is to have background video with parallax using CSS. In general I did manage to do that, but result is not good enough. Because of some reason, video which is in background is under all sections, instead of being in just one section where it supposed to be...

HTML:

<div class="fullScreenPhoto"></div>
<div class="video-container">
  <video autoplay poster="" class="video-parallax" loop muted>
    <source src="https://showbox-tr.dropbox.com/transcode_video/t/1qz2fy47wt9ay7i/header_background.mp4" type="video/webm">
    <source src="https://showbox-tr.dropbox.com/transcode_video/t/1qz2fy47wt9ay7i/header_background.mp4" type="video/mp4">
  </video>
</div>

<div class="fullScreenPhoto2"></div>

<div class="fullScreenPhoto3"></div>

CSS:

body{
  margin: 0;
  padding:0
}

.fullScreenPhoto{
  width: 100%;
  margin:0;
  height:300px;
  background-color: red;
}

.fullScreenPhoto2{
  width: 100%;
  height:300px;
    margin:0;
  background-color: green;
}
.fullScreenPhoto3{
  width: 100%;
    margin:0;
  height:300px;
  background-color: yellow;
}

video {
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -100;
    transform: translateX(-50%) translateY(-50%);
    background-size: cover;
    transition: 1s opacity;
}

.video-container {
    height: 600px;
}

.video-parallax {
    -webkit-transition-position: fixed;
    position: fixed;
}

Here you can fiddle: Fiddle

where I've duplicated my issue. If you will hide one section, or change z-index for higher, you are able to see, that video is all over the page...

BTW. I know about plugin jQuery -> https://github.com/linnett/backgroundVideo, but I would like to use just CSS.

Answer 1

If you want video to be background only for this one div then you couldn't have parallax effect, because then you need remove position: fixed for .video-parallax (so all styles for this class as I see) and change styles for video to that:

video {
    margin:0 auto;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -100;
    background-size: cover;
    transition: 1s opacity;
}