// Choose Category For Posts
    $cmb->add_field( array(
        'name'    => esc_html__( 'Category', 'majestica' ),
        'desc'    => esc_html__( 'Category of Posts to Display. If using one of the templates that displays a number of posts.', 'majestica' ),
        'id'      => 'majestica_posts_category',
        'taxonomy'       => 'category', //Enter Taxonomy Slug
        'type'           => 'taxonomy_select',
    ) );

$categoryname = get_post_meta( get_the_ID(), 'majestica_posts_category', true );
echo $categoryname;