I n Japan , the sushi bar where the chef chops fish for the clientele is a kind of stage. In which case all the world’s a sushi bar for Nobuyuki Matsuhisa, whose deluxe Nobu chain has taken root in dozens of cities across the globe. Matt Tyrnauer’s chirpy documentary charts the rise of this affable but restless pioneer, motivated since the start of his career to break out of insular Japan and shake up its cuisine. Signature dishes like his iconic black cod with miso – made with Alaskan sablefish – or Peruvian-influenced yellowtail sashimi with jalapeno veer well off the sushi-restaurant template. But don’t call it fusion, Tyrnauer’s film says early on; it’s still Japanese food, just open to foreign ingredients and techniques. After a rocky start in life, in which a young Matsuhisa was placed on probation after reckless driving, he got “lost in sushi”.…