How to Hide Webcam Microphone Screen Recorder - HTML5 Web Based Admin Menus

function plt_hide_video_posts_webcam_recorder_menus() {
	//Hide "HTML5 Recorder".
	remove_menu_page('recorder');
	//Hide "HTML5 Recorder → HTML5 Recorder".
	remove_submenu_page('recorder', 'recorder');
	//Hide "HTML5 Recorder → New Recording".
	remove_submenu_page('recorder', 'recorder-new');
	//Hide "HTML5 Recorder → Settings".
	remove_submenu_page('recorder', 'recorder-settings');
}

add_action('admin_menu', 'plt_hide_video_posts_webcam_recorder_menus', 11);

Where do I put this code?