post-registrations.php

// Register 'video' custom post type
function register_post_type() {
		$labels = array(
			'name'               => __( 'Videos', 'video-post-type' ),
			'singular_name'      => __( 'Video', 'video-post-type' ),
			'add_new'            => __( 'Add Video', 'video-post-type' ),
			'add_new_item'       => __( 'Add Video', 'video-post-type' ),
			'edit_item'          => __( 'Edit Video', 'video-post-type' ),
			'new_item'           => __( 'New Video', 'video-post-type' ),
			'view_item'          => __( 'View Video', 'video-post-type' ),
			'search_items'       => __( 'Search Videos', 'video-post-type' ),
			'not_found'          => __( 'No videos found', 'video-post-type' ),
			'not_found_in_trash' => __( 'No videos in the trash', 'video-post-type' ),
		);

		$supports = array(
			'title',
			'editor',
			'revisions',
			'thumbnail',
		);

		$args = array(
			'labels'          => $labels,
			'supports'        => $supports,
			'public'          => true,
			'capability_type' => 'post',
			'menu_position'   => 30,
			'menu_icon'       => 'dashicons-video-alt2',
			'show_in_rest'    => true,
			'has_archive'     => true,
			'hierarchical'    => true,
			// Permalink rewrite function in 'functions/posts.php'
			'rewrite'         => array( 'slug' => 'about-us/video-center/%category%', 'with_front' => false )
		);

		$args = apply_filters( 'case_result_post_type_args', $args );

		register_post_type( $this->post_type, $args );
}


// Register 'video-category' taxonomy
function register_taxonomy_category() {
		$taxonomies = array(
			// Video categories
			array(
				'slug'         => 'video-category',
				'single_name'  => 'Video Category',
				'plural_name'  => 'Video Categories',
				'post_type'    => 'video',
				'rewrite'      => array( 'slug' => 'about-us/video-center', 'with_front' => false );
			),
		);
		foreach( $taxonomies as $taxonomy ) {
			$labels = array(
				'name' => $taxonomy['plural_name'],
				'singular_name' => $taxonomy['single_name'],
				'search_items' =>  'Search ' . $taxonomy['plural_name'],
				'all_items' => 'All ' . $taxonomy['plural_name'],
				'parent_item' => 'Parent ' . $taxonomy['single_name'],
				'parent_item_colon' => 'Parent ' . $taxonomy['single_name'] . ':',
				'edit_item' => 'Edit ' . $taxonomy['single_name'],
				'update_item' => 'Update ' . $taxonomy['single_name'],
				'add_new_item' => 'Add New ' . $taxonomy['single_name'],
				'new_item_name' => 'New ' . $taxonomy['single_name'] . ' Name',
				'menu_name' => $taxonomy['plural_name']
			);
			
			$rewrite = isset( $taxonomy['rewrite'] ) ? $taxonomy['rewrite'] : array( 'slug' => $taxonomy['slug'] );
			$hierarchical = isset( $taxonomy['hierarchical'] ) ? $taxonomy['hierarchical'] : true;
		
			register_taxonomy( $taxonomy['slug'], $taxonomy['post_type'], array(
				'hierarchical' => $hierarchical,
				'labels' => $labels,
				'show_ui' => true,
				'query_var' => true,
				'rewrite' => $rewrite,
				'show_in_rest' => true
			));
		}
}

// Re-write %category% placeholder
function rewrite_video_cpt_permalinks( $post_link, $post ){
    if ( is_object( $post ) && $post->post_type == 'video' ){
        $terms = wp_get_object_terms( $post->ID, 'video-category' );
        if( $terms ){
            return str_replace( '%category%' , $terms[0]->slug , $post_link );
        }
    }
    return $post_link;
}
add_filter( 'post_type_link', 'rewrite_video_cpt_permalinks', 1, 2 );