Fire and Ice (1983)
Fire and Ice is a 1983 American animated adventure-fantasy film directed by Ralph Bakshi. The film, a collaboration between Bakshi and Frank Frazetta, was distributed by 20th Century Fox, which also distributed Bakshi's 1977 release, Wizards. The animated feature, based on characters Bakshi and Frazetta co-created, was made using the process of rotoscoping, in which scenes were shot in live action and then traced onto animation cels.
More at Wikipedia.