film (n.)youdaoicibaDictYouDict
Old English filmen "membrane, thin skin, foreskin," from West Germanic *filminjan (cognates: Old Frisian filmene "skin," Old English fell "hide"), extended from Proto-Germanic *fello(m) "animal hide," from PIE *pel- (4) "skin, hide" (cognates: Greek pella, Latin pellis "skin").

Sense of "a thin coat of something" is 1570s, extended by 1845 to the coating of chemical gel on photographic plates. By 1895 this also meant the coating plus the paper or celluloid. Hence "a motion picture" (1905); sense of "film-making as a craft or art" is from 1920.
reverse (adj.)youdaoicibaDictYouDict
c. 1300, from Old French revers "reverse, cross, opposite" (13c.), from Latin reversus, past participle of revertere "turn back, turn about, come back, return" (see revert). Reverse angle in film-making is from 1934. Reverse discrimination is attested from 1962, American English.
cinéma-véritéyoudaoicibaDictYouDict
"A style of film-making characterized by realistic, typically documentary films which avoid artificiality and artistic effect and are generally made with simple equipment", French, literally 'cinema truth'.