<style>
#video-box {min-width:1200px; position:relative;}
#video-box .main-banner {display:none; width:100%; height:750px;  overflow:hidden;position:relative; background-color:#000;}
#video-box .main-banner.open{display:block;}
#video-box .main-banner video {position:absolute;width:100%;top:50%; left:50%;transform:translate(-50%,-50%);border:0;}
#video-box .dot-box {position:absolute; width:100%; bottom:0; text-align:center;}
#video-box .dot-box a{display:inline-block; margin:0.5em; width:20px;height:20px; border-radius:50%; background-color:#06F;text-indent:-9999px;}
#video-box .dot-box a.open{background-color:yellowgreen;}
@media screen and (max-width:1400px) { #video-box .main-banner {height:550px;} }
</style>
<div id="video-box">
    <div class="main-banner open">
        <video autoplay muted>
            <source src="https://www.bodyfriend.co.kr/video/1.mp4" type="video/mp4">
        </video>
    </div>
    <div class="main-banner">
        <video muted>
            <source src="https://www.bodyfriend.co.kr/video/main02.mp4" type="video/mp4">
        </video>
    </div>
    <div class="main-banner">
        <video muted>
            <source src="https://www.bodyfriend.co.kr/video/main03.mp4" type="video/mp4">
        </video>
    </div>
    <div class="dot-box"></div>
</div>
<script>
$(function() {
    var len = $('.main-banner').length
    $('.main-banner').each(function(index, element) {
           $(this).addClass('v' + index);
        var video = $(this).find('video')[0];
        video.onended = function(e) {
            $('.main-banner').removeClass('open');
            $('.main-banner.v'+((index+1) % len)).addClass('open');
            $('.main-banner.v'+((index+1) % len)).find('video')[0].play();
            $('#video-box a.dot').removeClass('open');
            $('#video-box a.dot.v'+((index+1) % len)).addClass('open');
        };
        $('#video-box .dot-box').append('<a href="#" class="dot v'+index+'" data-idx="'+index+'">'+(index+1)+'번째 비디오</a>');
    });
    $('#video-box a.dot').click(function(e) {
        var idx = $(this).data('idx');
        $('.main-banner.open').find('video')[0].pause();
        $('.main-banner').removeClass('open');
        $('.main-banner.v'+(idx % len)).addClass('open');
        $('.main-banner.v'+(idx % len)).find('video')[0].play();
        $('#video-box a.dot').removeClass('open');
        $('#video-box a.dot.v'+(idx % len)).addClass('open');
    });
    $('#video-box a.dot.v0').addClass('open');
});
</script>