For getting captions from the v3 API, you must specify the id resource.
Check list_caption_tracks for more information.
Arguments
- id
- String. Required. id of the caption track that is being retrieved 
- lang
- Optional. Default is - en.
- format
- Optional. Default is - sbv.
- as_raw
- If - FALSEthe captions be converted to a character string versus a raw vector
- ...
- Additional arguments passed to - tuber_GET.