Bob has a right to privacy that covers virtually everything Bob wants to keep private. For example:
- He has the right to keep his face private.
- He has the right to keep his Social Security number private.
- He has the right to keep his stamp collection private.
- He has the right to keep his sex life private.
Of course, as an American, Bob is not legally obligated to exercise any of these rights; he is equally free to waive his privacy rights by showing any of these things to the public. For example:
- He is allowed to walk around and show his face in public.
- He is allowed to paint his Social Security number on his garage door.
- He is allowed to make a website about his stamp collection.
- He is allowed to tell his friends about his sex life.
In your scenario, Bob has voluntarily put himself out in front of the public, so he has waived his right to privacy with respect to the fact of his presence on the sidewalk; he has no enforceable right to keep secret the fact that he was out there. Meanwhile, the vlogger has a First Amendment right to film everyone on the sidewalk. Am. Civil Liberties Union of Ill. v. Alvarez, 679 F.3d 583, 595 (7th Cir. 2012) (“The act of making an audio or audiovisual recording is necessarily included within the First Amendment's guarantee of speech and press rights.”)
It is fairly clear, then, that Bob's unexplained preference for not being on camera must yield to the vlogger's legal rights.
If Bob nonetheless wishes to avoid being on the video, he has several options. He can:
- Turn around
- Duck into a building
- Put a bag over his head
- Ask the vlogger to delete any footage of him
- Ask the vlogger to blur his face
