et al at Nvidia combines autoencoders and GANs to bidirectionally transform footage from day to night, winter to summer, real to video-game-ish. Wild! https://arxiv.org/abs/1703.00848
Ah darn. I've been able to get pix2pix into CoreML but CycleGAN has these weird batch operations that don't translate well. Anyway, thanks for the link, can't wait to read!