User can access only own media in wordpress

add_filter( 'ajax_query_attachments_args', 'show_users_own_attachments', 1, 1 );

function show_users_own_attachments($query){
  $id = get_current_user_id();
  if( !current_user_can('manage_options') )
  $query['author'] = $id;
  return $query;
}