There is no added invasion of privacy here, just automating face recognition.
In effect, you seem to be opposed to replacing brain processing with computer processing, which is squarely on the wrong side of history.
This is going to happen, whether we like it or not. Banning it is a stopgap, we just need to start working on regulating it and defining the boundaries of such practices.
The idea of a wearable HUD is cool, but I don't see how any implementation can ever by trustworthy to non-wearers.