If you are a video's owner or have edit access to a video, you can delete that video's Transcript and captions file. To do so:
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Open the video
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Select Video settings from the upper-right corner of the video
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Expand the Transcript and captions field
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Select the Delete icon (trash can) next to the file
Note: If the file you’re deleting is a transcript from a Teams meeting recording, the transcript will still be available in Teams unless you also delete it from the meeting there.
If you accidentally delete a transcript and caption file, you can recover it by using version history in OneDrive for Business and SharePoint.