Aronofsky’s “Noah” has some pretty interesting depictions of what I believe were fallen angel stone giants intended to represent the Nephilim. I also found it interesting how the depraved human society God sent the floods to destroy was depicted as an industrialized society harvesting some sort of strange resource that was destroying the planet.

Not quite the same but The Inheritors by William Golding explores the coexistence of the two groups.

So does Robert J. Sawyer's "Neanderthal Parallax" series: https://www.goodreads.com/series/40828-neanderthal-parallax

Here's one more https://en.wikipedia.org/wiki/Dance_of_the_Tiger