Embed Youtube Player With Autoplay And Sound Muted

Hello, I need a youtube video on my website.
With automatic playback and mute, change 0.
I’m in time with this difficulty, until I get to you.
I have seen that there is a function as below.
I did as it was taught, but it did not work.
Using wordpress, I put the script in the text tab.
Nothing works, not even the video loads.
I really need your help.

<!– 1. The (and video player) will replace this tag. –>

// 2. This code loads the IFrame Player API code asynchronously.
var tag = document.createElement(‘script’);
tag.src = “https://www.youtube.com/iframe_api”;
var firstScriptTag = document.getElementsByTagName(‘script’)[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
// 3. This function creates an (and YouTube player)
// after the API code downloads.
var player;
function onYouTubeIframeAPIReady() {
player = new YT.Player(‘player’, {
height: ‘315’,
width: ‘560’,
videoId: ‘ozU6xBp9_ho’,
events: {
‘onReady’: onPlayerReady,
‘onStateChange’: onPlayerStateChange
}
});
}
// 4. The API will call this function when the video player is ready.
function onPlayerReady(event) {
event.target.setVolume(0);
event.target.playVideo();
}
// 5. The API calls this function when the player’s state changes.
// The function indicates that when playing a video (state=1),
// the player should play for six seconds and then stop.
var done = false;
function onPlayerStateChange(event) {
if (event.data == YT.PlayerState.PLAYING && !done) {
// setTimeout(stopVideo, 6000);
done = true;
}
event.target.setVolume(0);
}