I don't see how it would be unreasonable for the prosthetic eye setup to come with a LED that lights up when the video stream is being recorded to storage or streamed to the internet, no.
Nobody's suggesting that you should be required to have an indicator that tells people you're looking at them. That's stupid.
How is this different then human memory? Why can't recordering something in my augmented brain be my choice and have nothing to do with you? You don't get to choose what I remember. Why should you get to choose how I remember it or why should I have to inform you that I'm remembering it in a certain way?
Nobody's suggesting that you should be required to have an indicator that tells people you're looking at them. That's stupid.