I did sous vide chilli oil by placing the oil and chillies in glass canning jars in the water bath. I let them rip for about 90 minutes at ~88°C/190°F and the results were pretty good. I like the roasty/mildly bitter results from flash heating, but this was quite smooth and pleasant.

I think some purists would think it tastes weird. It's a very "clean" chilli flavour. I think it would have been a lot better with more aromatics, and when I'm done with this oil I'll likely give that a shot.