The first Martial Arts Film that feature Huo Yuan Jia Fok Yuen Gap at least in name is the 1972 Hong Kong Martial Arts Classic Fist Of Fury Starring Bruce Lee. Where Bruce Lee plays the fictional Student of Huo Yuan Jia Chen Zhen (Chan Zan/Can Zan in Cantonese).
The Film does feature Mizong Quan Maih Jung Kyun albeit briefly in the Fight against Bruce Lee and his real life Student Bob Baker (Robert Baker).