hi there,
we used this "technique" for some of our works. Only non and few moving objects and people manifest in the pictures/videos. We don`t want to filter every person out but try to find something inbetween by adjusting the variables in our programming (max/msp/jitter). We also refer to to Daguerre photo mentioned above. Take a look if you like:

A MOMENTARY LAPSE
http://www.springerparker.com/works_lapse.html

ON BROADWAY
http://www.springerparker.com/works_broadway.html

THE OUTSIDER'S AWARENESS
http://www.springerparker.com/works_outsiders.html

cheers,
SP