Hi Luke,
I believe seeking aid on a formal dissertation for an academic degree is usually illegal on most university campuses....but what the hell!
I'm not sure what you mean by "Primitivism"? I looked it up and it is loosely definied as looking to the past, or looking in the opposite direction as technology that causes self alienation, or a cultural attitude that has informed diverse aspects of Modern art (which doesn't really say anything), or a reaction to the Enlightenment, or the general tendency to idealize any social behavior judged relatively primitive, or permissiveness, sexuality, the revelation of repressed urges associated with tribal culture and pre-Christian religious practices
including human sacrifice.
It doesn't seem to imply that a work of art labeled as "Primitivisim" is lacking in sophistication or is primitive in its construction. From this I can only assume that you are looking at Stravinsky's early period and not the neo-classical period, and certainly not the late serialist period? Well, if you go for the early period, the Rite of Spring seems to be the piece that most displays the musical aspects of "Primitivism" as I understand it. However, it's the most famous orchestra work of the 20th century so its musical characteristics have influenced everyone. It might be hard to tie all "primitive" musical moments in movie scores to the Rite because everyone started "trying" to write like that after Stravinsky wrote that piece.
I would start by looking at movies that have primitive themes (I don't mean musical themes) or moments like "Planet of the Apes", or movies that explore primal sexuality or exoticism like "Interview with a Vampire" (that's not the best example, but it's the first one that came to mind), or movies that take place in "older" more primitive times, or movies that explore psychological "Primitivism" like horror movies, "Psycho" comes to mind.
Then there is music that seems to have no connection to Stravinsky on the surface, but oozes "Primitivism" in sexuality and perverse dancing like electronica/dance music ("The Matrix"...that fluttery woodwind sound that Don Davis uses with 4ths and 5ths is also very Stravinsky-esque), or anything with perpetual rhythm.
Then they are movie composers that have assimilated Stravinsky-esque sounds into their own musical pallette. Danny Elfman's music always seems heavily Stravinsky influenced to me though the quality of his music is never that great. Elliot Goldenthal would be another.
Then there are moments where the film music sounds like it was almost cut and pasted right out of the Rite, but the films themselves really have nothing to do with primitivism. Star Wars "A New Hope" when R2D2 and C3PO land on Tatooine and are walking in the desert...that sounds a lot like the Second Part "The Exalted Sacrifice" Introduction to me. Almost any perpetual motor rhythm with horns and strings is going to sounds like "The Augurs of Spring"...you hear that all over the place in films.
Also if you include exoticism or orientalism as part of "Primitivism" then other early Stravinsky works open up to you like "Fireworks", or "Song of the Nightingale".
Ok I'll stop now.
Brian