Recently deleted videos

We assume that your iPhone 8 Plus is running iOS 16, correct?

If you are not sure......tap Settings > General > About and look for the iOS Version.

Tap to open Photos

Tap Albums at the borrow of the window

Scroll down and tap on Recently Deleted

If the videos were deleted less than 30 days ago, they will appear and you can tap to restore each one

If the videos do not appear in Recently Deleted, they were all deleted more than 30 days ago. In that case they are gone and cannot be recovered

Your other duplicate post asking the same question has been deleted because the answer is the same as your original post.