Create an embedded YouTube player that will load a video

ytplayer.js

var ytplayersinfolist = [];

//This function creates an <iframe> (and YouTube player)
//after the API code downloads
function onYouTubeIframeAPIReady() {
    if (typeof window.playerInfoList === 'undefined')
        return;
    for (var i = 0; i < window.playerInfoList.length; i++) {
        createYTPlayer(window.playerInfoList[i]);
    }
}

// This function loads the IFrame Player API code asynchronously
function registerYTIFrameApi() {
    var tag = document.createElement('script');
    tag.src = "https://www.youtube.com/iframe_api";
    var firstScriptTag = document.getElementsByTagName('script')[0];
    firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
}

function initYTPlayer(playerInfo) {
    return new YT.Player(playerInfo.id, {
        height: playerInfo.height,
        width: playerInfo.width,
        videoId: playerInfo.videoId
    });
}