I often think about the presence of the person with the camera when I watch travel documentaries - my favorites are when that presence is acknowledged. Like the one with a very old Japanese lady who is showing her chickens and how one just brought an egg, and she's going to eat this egg for breakfast. Look, she says to the interviewer. It's still warm! Here, hold it, see how warm it is! (he complies). And you hold it too, she says into the camera, and we see a hand extending into our view to obediently hold that egg.