Change role for WP user. For Video conferencing zoom PRO when registering in a meeting a new user is created role.

functions.php

//Add below code to your theme's functions.php file
add_filter('vczapi_pro_on_wp_user_create', 'vczapi_change_role');
function vczapi_change_role( $role ) {
    $role['role'] = 'your_custom_role';
    return $role;
}