<div class="main-vid-src">
<form role="search" action="<?php echo site_url('/'); ?>" method="get">
<input type="search" name="s" placeholder="Search for videos !" id="search-terms"/>
<input type="hidden" name="post_type" value="video" />
<?php
function get_terms_dropdown($taxonomies, $args){
        $myterms = get_terms($taxonomies, $args);
        $selected = "selected";
        $output ="<select><option selected='".$selected."'>Show everything</option>'";

        foreach($myterms as $term){
                $term_taxonomy=$term->videoscategory;
                $term_slug=$term->slug;
                $term_name =$term->name;
                $output .="<option name='".$term_slug."'>".$term_name."</option>";
        }
        $output .="</select>";
return $output;
}

$taxonomies = array('videoscategory');
$args = array('order'=>'name','hide_empty'=>true);
echo get_terms_dropdown($taxonomies, $args);

?>
<input type="hidden" name="taxonomy" value="videoscategory">
<input type="submit" id="searchsubmit" value="Search" />
</form>
</div>