HTML - Ayuda con boton de banner

video.off('ready', function() {

    jQuery(self.$item).append($muteBtn);

});

$muteBtn.off('click', function () {

    video.getunmute(function (on) {

        if (on) {

            video.unmute();

            $muteBtn.html('<i class="fa fa-volume-up"></i>');

        } else {

            video.mute();

            $muteBtn.html('<i class="fa fa-volume-off"></i>');

<video id="vid" style="width:100%; height:auto">

<source src="video.mp4" type="video/mp4">

</video>

<script>

var video=document.getElementById("vid");

function test() {

if (video.muted==true) {video.muted=false}

else {video.muted=true}

}

</script>

<button onclick="test()">Muted</button>