Comment Form // PHP Help Needed!

Hi guys,

I’ve got a question about editing the original wordpress comment form. Let me first explain the problem.

I’m using a theme which uses a very nice custom contact-form including a very nice captcha form.

For comments, the theme uses the default wordpress comment form which can be found in /wp-includes/comment-template.php

The thing is, I want the captcha form from the custom contact form included into the default comment form.

I’ve found out that the contact-form (to be found in one direction up: /wp-content/themes/THEMEHERE/includes/contact-form.php) uses the following code to display the captcha:

if(avia_get_option('contact-form-captcha') === 'active')
	{
		$elements['age'] =	array('type'=>'captcha', 'check'=>'captcha', 'label'=> __('Please proof that you are human by solving the equation','avia_framework'));
	}

Is there any way to include this captcha into the default comment form?

Additional information:
https://www.justinwust.com
and the custom contact form with captcha: https://www.justinwust.com/contact/

Thanks in advance!