I found the link over at Gun Free Zone. This is the money quote from the piece:
My message to my brethren is also simple: unless a person is materially interfering while videoing, simply leave them alone. If you are worried about what the video will capture, the issue is with you and not the person taking the video.
And again he Speaks clearly:
What I mean by no carte blanche is that officers simply cannot demand identity from a person and then arrest that person for failure to comply. Remember that any seizure of a person requires at minimum reasonable articulable suspicion of a crime (see above link on police-citizen contacts), and using a show of authority to compel identification is a seizure.
Thank you Cheif Weems.