code: def get_video_transcript(video_id, language_code):
      
      transcript = VideoTranscript.get_or_none(video_id=video_id, language_code=language_code)
      return TranscriptSerializer(transcript).data if transcript else None
docs: Get video transcript info
  
      Arguments:
          video_id(unicode): A video id, it can be an edx_video_id or an external video id extracted from
          external sources of a video component.
          language_code(unicode): it will be the language code of the requested transcript.