Earlier quoted context omitted.
You are required to respond to questions from them and verbally verify a) what you're are applying for b) read out the data written on the ID (passport or national ID) and c) move and wiggle the card around and occlude it with your finger so the agent can verify certain security features (holograms, picture, "shiny stripes" on the card). In my opinion, it would be quite hard to prerecord the whole process and/or reus…
Well, not yet, maybe? Given the state of the art in real-time video manipulation, including based in motion capture, I am not so sure that's gonna stay that way for long. Also, please don't use terms like "steal an identity", that is how banks frame things in order to make it appear that they are not responsible. Banks don't employ reliable authentication, thus they get defrauded by imposters--nothing is ever stolen…
For now, it remains somewhat secure in practice and will hopefully bye augmented by use of cryptography already available in many IDs (though, as other comments note, not widely used in some countries)