Div background zoom in - http://jsfiddle.net/k3qw9ka1/2/

background-zoom.css

// Trocar body pela Div
body:before {
    -webkit-animation: 10s normal forwards zoomin ease-in;
            animation: 10s normal forwards zoomin ease-in;
    background-image: url("http://www.artisanaljavascript.com/images/tradition.jpg");
    background-size: cover;
    content: " ";
    height: 100%;
    position: fixed;
    -webkit-transform-origin: center center 0;
            transform-origin: center center 0;
    width: 100%;
    -webkit-transform: scale(1.5);
            transform: scale(1.5);
}

@-webkit-keyframes zoomin {
  0%  {   -webkit-transform: scale(1);   transform: scale(1); } 
  100: {  -webkit-transform: scale(1.5);  transform: scale(1.5); }
}

@keyframes zoomin {
  0%  {   -webkit-transform: scale(1);   transform: scale(1); } 
  100: {  -webkit-transform: scale(1.5);  transform: scale(1.5); }
}