.bannerbgvideo {
    position: relative;
    height: 100vh;
    overflow: hidden;
}

.bannerbgvideo::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://img.youtube.com/vi/m1UftYa8iSU/maxresdefault.jpg') no-repeat center center;
    background-size: cover;
    z-index: -1;
}

.bannerbgvideo iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    z-index: -1;
    pointer-events: none;
}