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I believe it's jquery.
Caleb Kester1,710 Points
Looks like they have something with canvas going on there. I found a stack overflow topic with some insight into a similar idea: http://stackoverflow.com/questions/19953917/fade-pixelate-blurred-image-to-normal-after-mouse-over-using-jquery
John Lucey9,448 Points
Caleb Kester has a great answer, I believe they are using an HTML Canvas with Jquery to create the effect. Here is a similar project on code pen using dots instead of an image so you can get a look at the code. and play with the demo. Post back if you get it worked out. Good luck and enjoy!
DIEGO RODRIGUEZ VIDAL2,850 Points
Thanks for your responses, I am having a look to the project on code pen and it´s really interesting. I will let you know if I get it worked out. :)