Contact Form 7?

Yes, you can. Go to https://www.ads-software.com/plugins/easy-fancybox/faq/ and find “Can I display a contact form in FancyBox?” near the end with an example.

I managed to successfully add a contact form 7 in fancybox, however i’m unable to control the dimensions (width x height) of the pop up window despite configuring settings at the plugin.

You can have a look at here : https://buildingmaterials.com.my/testing-pop-up/#contact_form_pop

Could you please advice?