video_id — search always runs against a collection or your whole library, described in Search a Collection. Once you have a video_id, either from a search result or from listing a collection, use it to fetch that video directly:
playback_url is a presigned URL valid for about an hour — fetch a fresh one each time you need to play the video rather than caching it. See Metadata for every field on the video object.
If you want “more like this, in this video”
If a search already returned segments from the video you care about, you have thevideo_id for each — filter the response client-side rather than making a second request. For finding visually similar moments across the same library (not scoped to one video), see Image Search: submit one of the video’s own frame thumbnails as a reference image.
Deleting a video
204 No Content. This cannot be undone.