How do I make my youtube videos appear with fast site loading? - youtube

Question

I restate my question here:
When I work on a test page of my site (https://www.jobcool.fr/single.html), the youtube videos appear but when I put this page on the internet with filezilla, the videos no longer work.
I used a code that can lighten the weight of youtube videos
<script>
( function() {
var youtube = document.querySelectorAll( ".youtube" );
for (var i = 0; i < youtube.length; i++) {
var source = "https://img.youtube.com/vi/"+ youtube[i].dataset.embed +"/sddefault.jpg";
var image = new Image();
image.src = source;
image.addEventListener( "load", function() {
youtube[ i ].appendChild( image );
}( i ) );
youtube[i].addEventListener( "click", function() {
var iframe = document.createElement( "iframe" );
iframe.setAttribute( "frameborder", "0" );
iframe.setAttribute( "allowfullscreen", "" );
iframe.setAttribute( "src", "https://www.youtube.com/embed/"+ this.dataset.embed +"?rel=0&showinfo=0&autoplay=1" );
this.innerHTML = "";
this.appendChild( iframe );
} );
};
} )();
</script>
/*=======VIDEO YOUTUBE=======*/
.video .youtube {
background-color: #000;
position: relative;
padding-top: 56.25%;
overflow: hidden;
cursor: pointer;
}
.youtube img {
width: 100%;
top: -16.82%;
left: 0;
opacity: 0.7;
}
.youtube .play-button {
width: 90px;
height: 60px;
background-color: #333;
box-shadow: 0 0 30px rgba( 0,0,0,0.6 );
z-index: 1;
opacity: 0.8;
border-radius: 6px;
}
.youtube .play-button:before {
content: "";
border-style: solid;
border-width: 15px 0 15px 26.0px;
border-color: transparent transparent transparent #fff;
}
.youtube img,
.youtube .play-button {
cursor: pointer;
}
.youtube img,
.youtube iframe,
.youtube .play-button,
.youtube .play-button:before {
position: absolute;
}
.youtube .play-button,
.youtube .play-button:before {
top: 50%;
left: 50%;
transform: translate3d( -50%, -50%, 0 );
}
.youtube iframe {
height: 100%;
width: 100%;
top: 0;
left: 0;
}
.video {
display: block;
width: 600px;
margin: 0 auto 35px auto;
max-width: 100%;
}
/*=======CADRE DE LA VIDEO YOUTUBE=======*/
.video .wrapper {
border: 5px solid black;
width: 100%;
}
/*=======CADRE DE LA VIDEO=======*/
.video .wrapper {
width: 100%;
padding: 7.5px 7.5px;
border: 1px solid #C9C9C9;
-webkit-box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19),
0 6px 6px rgba(0, 0, 0, 0.23);
-moz-box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19),
0 6px 6px rgba(0, 0, 0, 0.23);
-ms-box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19),
0 6px 6px rgba(0, 0, 0, 0.23);
-o-box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19),
0 6px 6px rgba(0, 0, 0, 0.23);
box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19),
0 6px 6px rgba(0, 0, 0, 0.23);
}
.video .wrapper {
-webkit-transform: rotate(-2deg);
-moz-transform: rotate(-2deg);
}
/* Rotate all even images 2 degrees */
.video .wrapper:nth-child(even) a img {
-webkit-transform: rotate(2deg);
-moz-transform: rotate(2deg);
}
/* Don't rotate every third image, but offset its position */
.video .wrapper:nth-child(3n) a img {
-webkit-transform: none;
-moz-transform: none;
position: relative;
top: -5px;
}
/* Rotate every fifth image by 5 degrees and offset it */
.video .wrapper:nth-child(5n) a img {
-webkit-transform: rotate(5deg);
-moz-transform: rotate(5deg);
position: relative;
right: 5px;
}
/* Keep default rotate for every eighth, but offset it */
.video .wrapper:nth-child(8n) a img {
position: relative;
top: 8px;
right: 5px;
}
/* Keep default rotate for every eleventh, but offset it */
.video .wrapper:nth-child(11n) a img {
position: relative;
top: 3px;
left: -5px;
}
.video .wrapper:hover {
-webkit-transform: scale(1.25);
-moz-transform: scale(1.25);
position: relative;
z-index: 5;
}
.video .wrapper {
-webkit-transition: -webkit-transform .15s linear;
-webkit-box-shadow: 0 3px 6px rgba(0, 0, 0, .25);
-moz-box-shadow: 0 3px 6px rgba(0, 0, 0, .25);
}
/* On hover, darken the shadows a bit */
.video .wrapper {
-webkit-box-shadow: 0 3px 6px rgba(white);
-moz-box-shadow: 0 3px 6px rgba(white);
}
<div class="video" data-id="abn-w2Gs54o">
<div class="wrapper">
<div class="youtube" data-embed="abn-w2Gs54o">
<div class="play-button"></div>
</div>
</div>
</div>
Could you help me understand why?
Best regards
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