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It's trivial to photoshop an image to show those movements (even the nose picking). It's only marginally more difficult to write an app to apply those transformations on demand. Which is what would happen if such an authentication system were ever put into use.
You simply cannot trust a remote system to be showing you an image of what is genuinely there.
itsbruce
Ok, let's take facial recognition. The device sends the data, the site reads the data and decides if you are who you say you are. In order to make it difficult to fake the data, the site asks you to make particular head/eye movements or facial expressions so that the data is specific to each login session. What am I missing?