After searching both Stack Overflow and Google I still wonder how to vertical center a image that is bigger than it's parent element. I use no height, just max-height, because I want to make a responsive solution, without jQuery. If possible.
Here is some code:
<div style="max-height: 425px; overflow: hidden;">
<img src="http://img.youtube.com/vi/jofNR_WkoCE/maxresdefault.jpg">
</div>
to center vertically a bigger image you can use the construction and css bellow
<div class="img-wrapper">
<img src="http://img.youtube.com/vi/jofNR_WkoCE/maxresdefault.jpg">
</div>
And css:
.img-wrapper{
position: relative;
overflow:hidden;
height:425px;
}
.img-wrapper img{
position: absolute;
top:-100%; left:0; right: 0; bottom:-100%;
margin: auto;
}