Instant photo of both parties while in a FaceTime call

The idea is to have a button that captures simultaneously the two images of the 2 parties in a call in two separate pictures to be able to process them after with photo editors in order to create a moment between the two parties in the form of a picture frame with both pictures. You just push a button while on the call and then you got it. You can do it at the moment by capturing the screen but it's not really editable and one of the pictures is small