video {
    margin-top: 10rem;
    box-shadow: .5rem .5rem 1.5rem #000;
    transition: all 1s ease;
}
video:hover{
    transform: translate(-10vw, -10vh) scale(1.5);
}

@media screen and (max-width:768px) {
    video {
        margin-top: 1rem;
    }
    video:hover{
        transform: translate(0, 0) scale(1);
    }
}