get
https://example.com/public-api/v1/meetings//viewers
List the users who have played the video — paginated, most recent first.
Each entry carries the play-record id, one entry per distinct user.
play_users is empty when no one has played the video yet. The full list
is paginated with an opaque cursor (first + offset XOR
after); pass page_info.end_cursor / start_cursor back as
after to page. Returns 404 when the video id is unknown, and 422 for a
malformed id or bad pagination params (at request validation).