Oinktube/plugin/PlayerSkins/loopbutton.js

function setImageLoop() {
    if (isPlayerLoop()) {
        $('.loopButton').removeClass('opacityBtn');
        $('.loopButton').addClass('fa-spin');
    } else {
        $('.loopButton').addClass('opacityBtn');
        $('.loopButton').removeClass('fa-spin');
    }
}

function toogleImageLoop(t) {
    tooglePlayerLoop();
    if (typeof setImageLoop === 'function') {
        setImageLoop();
    }
}

$(document).ready(function () {

    var Button = videojs.getComponent('Button');

    var LoopButton = videojs.extend(Button, {
        //constructor: function(player, options) {
        constructor: function () {
            Button.apply(this, arguments);
            this.addClass('loop-button');
            if (!isPlayerLoop()) {
                this.addClass('loop-disabled-button');
            } else {
                this.addClass('fa-spin');
            }
            this.controlText("Loop");
        },
        handleClick: function () {
            tooglePlayerLoop();
        }
    });

    videojs.registerComponent('LoopButton', LoopButton);
    player.getChild('controlBar').addChild('LoopButton', {}, 0);
});