Gifted nonfiction filmmakers Michael Dweck and Gregory Kershaw have made a specialty of documenting tradition-bound practices rooted in the soil. In The Truffle Hunters, it was the disappearing breed of men and their sniffer dogs roaming the hills of Italy’s Piedmont region in search of aromatic Alba tubers that fetch a high price in the best restaurants. In Gaucho Gaucho, it was the community of Argentinian cowboys stewarding the land and tending to their animals off the grid in the mountainous Salta region. In Burgundy, the directors train their exquisitely observational vérité gaze over the vineyards, owners and workers whose lives revolve around production and consumption of the famed French red. (White burgundies don’t get a look in.) Burgundy The Bottom Line A drop to be savored. Venue: Venice Film Festival (Out of Competition)Director-writers: Michael Dweck, Gregory Kershaw 1 hour 30 minutes Dweck and Kershaw have honed the skill, relatively rare among documentarians, of breathing lyrical dimensions into their lovingly crafted ethnographic studies. They also have a strong sense of character, which they step back and allow to emerge organically …