code: def get_video_transcript_url(video_id, language_code):
      
      video_transcript = VideoTranscript.get_or_none(video_id, language_code)
      if video_transcript:
          return video_transcript.url()
docs: Returns course video transcript url or None if no transcript
  
      Arguments:
          video_id: it can be an edx_video_id or an external_id extracted from external sources in a video component.
          language_code: language code of a video transcript