Adding button with plugin not working in lastest version

[Albermg7]

Hello,
I am trying to implement a plugin for videoJs jsut to add a button to the control bar. I have followed seen how to do it in some tutorials but it is not working in the last version (4.12). I have downloaded an oldest version (this dev version) directly from a demo page and maggicallyl it is working. The code is this:

    // Create the button
    videojs.InfoButton = videojs.Button.extend({
        init: function (player, options) {
            // Initialize the button using the default constructor
            videojs.Button.call(this, player, options);
            this.on('click', this.onClick);
        }
    });

    videojs.InfoButton.prototype.createEl = function () {
        var props = {
            className: 'vjs-info-button vjs-control',
            innerHTML: '<div class="vjs-info-button vjs-control-content"><span class="vjs-control-text">' + ('InfoButton') + '</span></div>',
            role: 'button',
            'aria-live': 'polite', // let the screen reader user know that the text of the button may change
            tabIndex: 0
        };

        return videojs.Button.prototype.createEl(null, props);
    };

    videojs.InfoButton.prototype.onClick = function () {
        alert("INFO!");
    };

    // Video.js Plugin Code 
    videojs.plugin('infoButton', function (options) {
        options = options || {};
        this.controlBar.addChild('InfoButton', options);
    });

With the latest version, the videojs.InfoButton.prototype.createEl function is actually not being called. So, is there a new way to do this? What have changed in new versions that is preventing my code from working properly?
Thansk a lot

[forbesjo]

Are you using the minified version of video.js? It looks like createEl is not available when minified so it is recommended to use the unminified version of video.js.

See #2016

[Albermg7]

Thanks forbesjo! That seems to be the problem. Since I have tried the minified version of the video.js used in the demo page I said and the plugin is not working either.

Can the unminified version be downloaded from the CDN?

[gkatsev]

Unfortunately, the unminified version of v4 isn't available on the CDN.
However, v5 is out and updating would be the recommended approach. It is available on the CDN in both minified and unminified flavors. See the change details page on the wiki for how to update.