CSS for the skin is available in the source code: http://www2.videojs.com/css/tube-css/tube.css .
The sprite used in css is available here: http://www2.videojs.com/css/tube-css/tubesprite.png .
According to the doc, you just need to replace the default vjs-default-skin class with a new one, in your case: tubecss
So, include the appropriate css in your page and do something like:
<video class="video-js tubecss" ...>
Note. On the videojs website, the skin class is applied to the video tag wrapper. I have not tested this, but both solutions must be valid.
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