Display Metabox on Post Format

gistfile1.php

/**
 * Show metabox on post format
 * @author @fredguth
 * @link https://github.com/jaredatch/Custom-Metaboxes-and-Fields-for-WordPress/wiki/Adding-your-own-show_on-filters
 *
 * @param bool $display
 * @param array $meta_box
 * @return bool display metabox
 */
function fg_metabox_show_on_post_format( $display, $meta_box ) {
    if ( 'post-format' !== $meta_box['show_on']['key'] )
        return $display;

    // Get the current ID
    if ( isset( $_GET['post'] ) ) {
        $post_id = $_GET['post'];
    } elseif ( isset( $_POST['post_ID'] ) ) {
        $post_id = $_POST['post_ID'];
    }

    //return false early if there is no ID
    if( !isset( $post_id ) ) return false;

    //Get format of the post
    $post_format = get_post_format( $post_id );

 	// If value isn't an array, turn it into one
    $meta_box['show_on']['value'] = !is_array( $meta_box['show_on']['value'] ) ? array( $meta_box['show_on']['value'] ) : $meta_box['show_on']['value'];

    return in_array( $post_format, $meta_box['show_on']['value'] );
}
add_filter( 'cmb_show_on', 'fg_metabox_show_on_post_format', 10, 2 );