Category attributed remove

 require_once("app/Mage.php");
 Mage::app('default');
 Mage::app()->setCurrentStore(

Mage_Core_Model_App::ADMIN_STORE_ID);
 $setup = new Mage_Eav_Model_Entity_Setup('core_setup');
 $entityTypeId = $setup->getEntityTypeId('catalog_category');

 $setup->removeAttribute($entityTypeId,'category_video');