Caprino was the son of furniture designer Mario Caprino and the artist Ingeborg Gude, which was a granddaughter of the painter Hans Gude. In the mid 1940s, he helped his mother design puppets for a puppet theatre, which inspired him to try making a film using his mother's designs. The result of their collaboration was Tim og Tøffe, an 8 minute film released in 1949 . Several films followed in the next couple of years, including two 15 minute shorts that are still shown regularly in Norway today, Veslefrikk med Fela (Little Freddy and his Fiddle), based on a Norwegian folk tale, and Karius og Baktus, a story by Thorbjørn Egner of two little trolls, representing Caries and Bacterium, living in a boy's teeth. Ingeborg Gude made the puppets for these films as well, as she would continue to do up until her death in the mid sixties.
When making Tim og Tøffe, Caprino invented an ingenious method for controlling the puppet's movements in real time. The technique can be described as a primitive, mechanical version of animatronics.
Caprino's films received rave reviews, and he quickly became a celebrity in Norway. In particular, the public were fascinated with the secret technology used to make his films. When he switched to traditional stop motion, Caprino tried to maintain the impression that he was still using some kind of "magic" technology to make the puppets move, even though all his later films were made with traditional stop motion techniques.
In addition to the short films, Caprino produced dozens of advertising films with puppets. In 1959, he directed a live action feature film, Ugler i Mosen, which also contained stop motion sequences. He then embarked on his most ambitious project, a feature film about Peter Christen Asbjørnsen, who travelled around Norway in the 19th century collecting traditional folk tales. The plan was to use live action for the sequences showing Asbjørnsen, and then to realise the folk tales using stop motion. Unfortunately, Caprino was unable to secure funding for the project, so he ended up making the planned folk tale sequences as separate 16 minute puppet films, bookended by live action sequences showing Asbjørnsen.
In 1970, Caprino and his small team of collaborators, started work on a 25 minutes TV special, which would eventually become The Pinchcliffe Grand Prix. Based on a series of books by Norwegian cartoonist and author Kjell Aukrust, it featured a group of eccentric characters all living in the small village of Pinchcliffe. The TV special was a collection of sketches based on Aukrust's books, with no real story line. After 1.5 years of work, it was decided that it didn't really work as a whole, so production on the TV special was stopped (with the exception of some very short clips, no material from it has ever been seen by the public), and Caprino and Aukrust instead wrote a screenplay for a feature film using the characters and environments that had already been built.
The result was The Pinchcliffe Grand Prix, which stars Theodore Rimspoke (No. Reodor Felgen) and his two assistants, Sonny Duckworth (No. Solan Gundersen), a cheerful and optimistic bird, and Lambert (No. Ludvig), a nervous, pessimistic and melancholic hedgehog. Theodore works as a bicycle repairman, though he spends most of his time inventing weird Rube Goldberg-like contraptions. One day, the trio discover that one of Theodore's former assistants, Rudolph Gore-Slimey (Norwegian language [No. Rudolf Blodstrupmoen), has stolen his design for a race car engine, and has become a world champion Formula 1 driver.
Sonny secures funding from an Arab oil sheik who happens to be vacationing in Pinchcliffe, and the trio then build a gigantic racing car, Il Tempo Gigante - a fabulous construction with two engines, radar and its own blood bank. Theodore then enters a race, and ends up winning, beating Gore-Slimey despite his attempts at sabotage.
The film was made in 3.5 years by a team of approximately 5 people. Caprino directed and animated, Bjarne Sandemose (Caprino's principal collaborator throughout his career) built the sets and the cars, and was in charge of the technical side, Ingeborg Riiser modeled the puppets and Gerd Alfsen made the costumes and props.
When it came out in 1975 , The Pinchcliffe Grand Prix was an enormous success in Norway, selling 1 million tickets in its first year of release. It remains the biggest box office hit of all time in Norway (Caprino Studios claim it has sold 5.5 million tickets to date) and was also released in many other countries.
To help promote the film abroad, Caprino and Sandemose built a full scale replica of Il Tempo Gigante that is legal for public roads, but is usually exposited at Hunderfossen familiepark.
Except for some TV work in the late seventies, Caprino made no more puppet films, focusing instead on creating attractions for the Hunderfossen theme park outside Lillehammer based on his folk tale movies, and making tourist films using a custom built multi camera setup of his own design that shoots 280 degrees panorama movies.
Since Caprino's death, his son Remo has had great success developing a computer game based on The Pinchcliffe Grand Prix.