WordPress at a glance
action is not described

wp_enqueue_media action-hook . WP 3.5.0

Fires at the conclusion of wp_enqueue_media().

Usage

add_action( 'wp_enqueue_media', 'action_function_name_2008' );
function action_function_name_2008(){
	// action...
}

Where the hook is called

wp_enqueue_media()
wp_enqueue_media
wp-includes/media.php 3663
do_action( 'wp_enqueue_media' );

Where the hook is used (in WP core)

Does not used.