Hover on portfolio featured images; fade from one image to another

Hi. First,  I would like to thank you for this magnificent theme builder you've created.

Now, I would like to add a hover to each portfolio featured image and I want it to fade from a blue monocromatic picture to a colored one. I mean, I want to be able to change the featured image to a different one. How can I do this? Do I have to write CSS code? Thank you very much.

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