Contact form 7 is the most used plugin for contact pages and general forms here this tutorial is about how you can set up your WordPress contact form 7 show in a popup window.
The easy way is to show the contact form in a popup window using the plugin “Easy fancy box“. This Plugin for WordPress websites gives you the freedom and solution for just about all media links on your website.
Once you Installed and activated both the plugins (Contact form 7 and Easy fancy box) go on and create your form the usual way. Every plugin out there gives you some sort of [short HTML code] that you can insert inside your page. That is all we need.
Once you created the contact form it generates a shortcode something like this[contact-form-7 404 "Not Found"]
Check your Easy fancy box settings under Settings > Media in user dashboard. Let all the settings by the default.
Now just copy the below code and paste it where you want the popup to be