function plt_hide_video_embed_box_menus() {
//Hide "Video Embed".
remove_menu_page('video-embed');
//Hide "Video Embed → Video Embed".
remove_submenu_page('video-embed', 'video-embed');
//Hide "Video Embed → New".
remove_submenu_page('video-embed', 'new-video-embed');
//Hide "Video Embed → Options".
remove_submenu_page('video-embed', 'video-embed-options');
}
add_action('admin_menu', 'plt_hide_video_embed_box_menus', 11);