E.g. in the EU we have ID cards and passports with biometric information and NFC, and there was a beta of a phone app by the French government where it would read your photo from the ID card/passport, and compare with a video selfie. That way you get fully local and secure identification allowing you to do stuff online that would otherwise require you to show up in person to a government office.
The scammer starts a video call with the person they want to impersonate and record it. When that person takes the call, the scammer doesn't say anything. This creates a 5-10 seconds video of the person looking at the camera waiting for the scammer to say something, until they get fed up and hung up.
The scammer then calls the victim. They offer a video call as verification straight away, and they play that short video.