using a borescope with MacBook

Two years ago I used a borescope connected by optical fibre to my MacBook. The MacBook screen shows what the camera sees. I used an application that came with the Mac, but I can't remember its name. Its image was of a theatre screen with the curtains open. I have a newer MacBook and attempted to do the same last week, but could not find the image or any other that would do the same function. I am using a MacBook 13 inch , late 2009 model with High Sierra version 10.13.6.

Suggestions please.

Graham