I need help with custom video section in product page (Dawn Theme)

[samirinterlink]

remove old css of .responsive-video you just add is css

.responsive-video {
    position: relative;
    width: 100%;
    max-width: 800px;
    height: 0;
    padding-bottom: 56.25%;
    background-color: black;
    margin: 0 auto;
}
.responsive-video > video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}