Tips on Customizing Video Player for YouTube

How to Hide Video Player for YouTube Admin Menus

function plt_hide_yt_player_menus() {
	//Hide "YT Players".
	remove_menu_page('edit.php?post_type=ytplayer');
	//Hide "YT Players → YT Players".
	remove_submenu_page('edit.php?post_type=ytplayer', 'edit.php?post_type=ytplayer');
	//Hide "YT Players → Add new".
	remove_submenu_page('edit.php?post_type=ytplayer', 'post-new.php?post_type=ytplayer');
	//Hide "YT Players → How To Use".
	remove_submenu_page('edit.php?post_type=ytplayer', 'ytp_howto');
	//Hide "YT Players → Contact Us".
	remove_submenu_page('edit.php?post_type=ytplayer', 'yt-player-contact');
	//Hide "YT Players → Support Forum".
	remove_submenu_page('edit.php?post_type=ytplayer', 'yt-player-wp-support-forum');
	//Hide "YT Players → Upgrade".
	remove_submenu_page('edit.php?post_type=ytplayer', 'yt-player-pricing');
}

add_action('admin_menu', 'plt_hide_yt_player_menus', 1000000000);

Where do I put this code?

How to Hide the "Configure Your Video Player" Meta Box

function plt_hide_yt_player_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Configure Your Video Player" meta box.
	remove_meta_box('_ytp', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_yt_player_metaboxes', 20);