#tv_container {
    width: 520px; 
    height: 456px; 
    position: relative;
}
#tv_container:after {
    content: '';
    display: block;
    background: url('images/videothumb.png') no-repeat top left transparent;
    width: 100%;
    height: 100%;
    left: 0px;
    top: 0px;
    position: absolute;
    z-index: 5;
}
#tv_container video {
    position: absolute;
    top: 11.5px; 
    left: 26.55px;
    z-index: 10;
}