video.js dosen't work on wp 4

Hi,
I’m trying to use video.js on a new wp4 site and I found your plugin.
I’ve installed it and it correctly load the css, js of video.js. However if I use the shortcode to output a video I got the standard html5render of the video tag and not the videojs output with custom interface control and so on.
Do you have any idea how to fix it?

Thanks
daniele

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