silver gelatin tintypes can also be done in the darkroom ... (i've done them in the darkroom )
maybe he shot the whole thing on film ( 35mm and an auto winder or 8mm film or ? )
and enlarged them on silver gelatin plates or glass ..
all the exposures would end up being exactly the same ... and it would be pretty easy.
From his Vimeo page
"Over 800 modern dryplate tintypes were made from b&w film to produce this experimental stop-motion video of a circus.
Antonio Martinez created this video to serve as a desired childhood memory of the circus, but through the mind of an adult.
The project began in 2005 and was fully completed in early 2010 with the help of sound designer, Ramah (Malebranche) Jihan, and assistant, Sarah (Lathrop) Midkiff. "
i contacted him :)
it was shot on film and printed on plates in the DR
then assembled &c with PS.
took 3 years ...