docs: def find_video_by_id(self, video_id):
          """doc: http://open.youku.com/docs/doc?id=44
          """
          url = 'https://openapi.youku.com/v2/videos/show_basic.json'
          params = {
              'client_id': self.client_id,
              'video_id': video_id
          }
          r = requests.get(url, params=params)
          check_error(r)
          return r.json()