@mijawidnazir Hello, I'm afraid it isn't possible to delete it as per today. It will stay in the chat available for 21 days. I suppose Microsoft can assist with that if it's critical, but then you would need to create a ticket with the official support.
The other day a rather big news was released that the recordings are not being stored in Teams/Stream beginning soon. They will instead be managed in OneDrive/SharePoint and that will solve this issue.