def parse_caption_track(item):
    """
    Returns the video_id, captions and collection_date.
    
    :params item: json document
    :type item: dict

    :returns: parsed dictionary
    :rtype: dict
    """
    caption_meta = {'video_id': item['video_id'], 'caption': item['caption'
        ], 'collection_date': item['collection_date']}
    return caption_meta
