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This JavaScript can be used to lazy load Youtube videos without WordPress. See instructions: https://wordpress.org/support/topic/plugin-not-activating-how-to-use-plugin-with-youtube-placed-directly-in-theme?replies=4#post-6041175
/*
* Lazy Load for Youtube
* by Kevin Weber
*/
var $lly = jQuery.noConflict();
$lly(document).ready(function() {
function doload_lly() {
$lly("a.lazy-load-youtube").each(function(index) {
var embedparms = $lly(this).attr("href").split("/embed/")[1];
if(!embedparms) {embedparms = $lly(this).attr("href").split("://youtu.be/")[1];}
if(!embedparms) {embedparms = $lly(this).attr("href").split("v=")[1].replace(/\&/,'?');}
var youid = embedparms.split("?")[0].split("#")[0];
var start = embedparms.match(/[#&]t=(\d+)s/);
if(start) {start = start[1];}
else {
start = embedparms.match(/[#&]t=(\d+)m(\d+)s/);
if(start) {start = parseInt(start[1])*60+parseInt(start[2]);}
else {
start = embedparms.match(/[?&]start=(\d+)/);
if(start) {start = start[1];}
}
}
embedparms = embedparms.split("#")[0];
if(start && embedparms.indexOf("start=") === -1)
{embedparms += ((embedparms.indexOf("?")===-1) ? "?" : "&") + "start="+start;}
if(embedparms.indexOf("showinfo=0") !== -1)
{$lly(this).html('');}
else
{$lly(this).html('<div class="lazy-load-youtube-info"><span class="titletext youtube">' + $lly(this).html() + '</div></div>');}
$lly(this).prepend('<div style="height:'+(parseInt($lly(this).css("height"))-4)+'px;width:'+(parseInt($lly(this).css("width"))-4)+'px;" class="lazy-load-youtube-div"></div>');
$lly(this).css("background", "#000 url(http://i2.ytimg.com/vi/"+youid+"/0.jpg) center center no-repeat");
$lly(this).attr("id", youid+index);
$lly(this).attr("href", "http://www.youtube.com/watch?v="+youid+(start ? "#t="+start+"s" : ""));
var emu = 'http://www.youtube.com/embed/'+embedparms;
emu += ((emu.indexOf("?")===-1) ? "?" : "&") + "autoplay=1";
var videoFrame = '<iframe width="'+parseInt($lly(this).css("width"))+'" height="'+parseInt($lly(this).css("height"))+'" style="vertical-align:top;" src="'+emu+'" frameborder="0" allowfullscreen></iframe>';
$lly(this).attr("onclick", "$lly('#"+youid+index+"').replaceWith('"+videoFrame+"');return false;");
});
}
$lly(document).ready(doload_lly()).ajaxStop(function(){
doload_lly();
});
});
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