Within minutes following the opening fade-in of “Gaucho Gaucho,” a trio of individuals can be seen dashing across a barren landscape, each sitting astride their own majestic-looking horse bathed in a sea of black and white with a South American backdrop beautifully framing the moment. It’s an appropriate setup to this documentary about gauchos, the colloquialism used to describe Argentinian cowboys and cowgirls, as the 84-minute runtime serves as little more than an exercise in striking photography mixed with a series of vignettes that’s as slice of life as one’s likely to find.