I recently had to authenticate myself online to use an internet-based service. The authentication process was done via video call with me holding my ID card in front of my laptop camera beside my face. I also had to wiggle the ID card so the person on the other end of the video call could see the security features that are printed on the ID card.
Then the person asked me to wave my hand in front of the ID card, so that it was shortly fully covered by my hand several times.
What is this method supposed to achieve or is this just security theater?