Get post list from different taxonomy?

I want that Quform plugin would automatically get my post list as checkboxes items. This code works perfectly:

function mytheme_dynamic_checkbox_values($form)
{
    $options = array();
    $query = new WP_Query(array('cat' => 9, 'posts_per_page' => -1));

    while($query->have_posts()) {
        $query->the_post();
        $options[] = array(
            'label' => get_the_title(),
            'value' => get_the_title()
        );
    }

    wp_reset_postdata();

    $checkboxes = $form->getElement('iphorm_20_4');
    if ($checkboxes instanceof iPhorm_Element_Multi) {
        $checkboxes->setOptions($options);
    }
}
add_action('iphorm_pre_display_20', 'mytheme_dynamic_checkbox_values');

But is there way to use this code for different taxonomy? In my theme I use portfolio posts with taxonomy “skills”. Here is example of portolio page template:

<?php
global $theme11; //for get_tempalte_part() calls
/* * ** QUERY STRAT *** */
$original_query = $wp_query;
$title = get_the_title();

//get from theme portfolio settings
$portfolio_page = $theme11->get_option('portfolio_options', 'portfolio_page');
$sort_type = $theme11->get_option('portfolio_options', 'portfolio_sort_type');
if ($sort_type != 'dynamic') {
    $sort_type = '';
}
$offset = 0;
global $paged;

$per_page = 80;

$args = array(
    'posts_per_page' => $per_page,
    'offset' => $offset,
    'post_type' => PORTFOLIO_POST_TYPE,
    'post_status' => 'publish',
    'ignore_sticky_posts' => true,
//	'orderby'             => 'epo_custom'
);

$term_slug = get_query_var('term');
if (!empty($term_slug)) {
    $portfolio_mode = 'static';
    $args['skills'] = $term_slug; //give portfolios from selected category
    $term_name = get_term_by('slug', $term_slug, 'skills');
    $title .= ' : ' . $term_name->name;
}
//get portfolio posts
$wp_query = new WP_Query($args);

/* * * QUERY END ** */

get_header();
?>
<?php ?>
<div id="content">
    <?php
    $bg_color = get_post_meta(get_the_ID(), '_background_color', true);
    $bg_image = get_post_meta(get_the_ID(), '_background_image', true);
    ?>
    <style type="text/css" media="screen">
<?php if ($bg_color != "") : ?>
            body { background-color: <?php echo $bg_color; ?> !important;}
<?php endif;
if ($bg_image != "") : ?>
            div.bgimage { background-image: url('<?php echo $bg_image ?>')!important; }

<?php endif; ?>
    </style>
    <div id="page_title" class="page_title_portfolio border_bottom">
        <h1><?php echo $title; ?></h1>
        <?php if (strlen(trim(get_post_meta(get_the_ID(), '_page_extra_description', true))) > 0): ?>
            <span>|</span> <p><?php echo trim(get_post_meta(get_the_ID(), '_page_extra_description', true)); ?></p>
        <?php endif; ?>
            <div style="clear: both;"></div>
    </div>
    <?php
    if ($wp_query->have_posts()) :
        //get portfolio categories
        $terms = get_terms('skills', 'hide_empty=1');
        $separator =  ' ';
        $count_terms = count($terms);
        $iter = 1;
        if ($count_terms):
            echo '<div id="portfolioList" class="no_content_font ' . $sort_type . ' portfolio_cat">';
            echo '<a href="' . site_url() . '?page_id=' . $portfolio_page . '" class="' . PORTFOLIO_PRE_CLASS . 'all' . ( empty($term_slug) ? ' selected' : '' ) . '">' . __('All', TPL_SLUG) . '</a>';
            echo $separator;
            foreach ($terms as $term) {
                echo '<a class="' . PORTFOLIO_PRE_CLASS . $term->slug . ( ($term_slug == $term->slug) ? ' selected' : '' ) . '" href="' . get_term_link($term) . '">' . $term->name . '</a>';
                if ($count_terms != $iter) {
                    echo $separator;
                }
                $iter++;
            }
            echo '</div>';
        endif;
    endif;
    ?>
    <div id="portfolio_conteiner" class="portfolio-elastic elastic no_content_font">

        <?php
        get_template_part('loop', 'portfolio');
        ?>
    </div>
    <?php //$theme11->blog_nav(); ?>
    <?php
    if (function_exists('wp_paginate')) {
        wp_paginate(array(
            'page' => $paged,
            'pages' => intval(ceil($wp_query->found_posts / $per_page))
        ));
    }
    ?>
    <div class="cleared"></div>
    <?php
    // Reset the global $the_post as this query will have stomped on it
    $wp_query = $original_query;
    wp_reset_postdata();
    ?>
</div>
<?php get_footer(); ?>

Can be anyting done, that this solution would work with my portfolio posts?