Header background video resizes if header height: 100vh

I am having a problem with playing video in a background of a header. I have set header height to 100vh (because i want it to take full height of viewport). And it does! But if you actually resize your browser window, the video wont be 100% of header, it just gets smaller and smaller. This is video css

```
video#bgvid { 
    position: fixed;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -100;
    -ms-transform: translateX(-50%) translateY(-50%);
    -moz-transform: translateX(-50%) translateY(-50%);
    -webkit-transform: translateX(-50%) translateY(-50%);
    transform: translateX(-50%) translateY(-50%);
    background: url(placeholder.jpg) no-repeat;
    background-size: cover; 
}
```

This true.. I using vidBg. He will see this work

https://github.com/blakewilson/vidbg

链接地址: http://www.djcxy.com/p/88224.html

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