/**
 *
 * Filter the post args
 *
 * @param  array $args
 * @return array $args
 */
function videotube_child_filter_scroll_post_args( $args ){

    global $post;

    if( term_exists( $post->post_name, 'categories' ) ){
        $args = array_merge( $args, array(
            'tax_query' =>  array(
                array(
                    'taxonomy'  =>  'categories',
                    'field'     =>  'slug',
                    'terms'     =>  $post->post_name
                )
            )
        ) );
    }

    return $args;

}
add_filter( 'mars_scrolling_post_args', 'videotube_child_filter_scroll_post_args', 10, 1 );