Hi zulunation ,
We don't support IMX378 use without DepthAI. As we've never used it outside of DepthAI.
I think ArduCam has drivers for IMX477 though, which is very similar. So if you're hoping to use such a sensor w/out DepthAI, I'd recommend using ArduCam's IMX477 solution instead.
To use the OAK-FFC-IMX378 with DepthAI, it would be required to purchase the OAK-FFC-3P, here:
https://shop.luxonis.com/collections/modular-cameras/products/dm1090ffc
Note that you can also buy them together as a kit, below (by selecting RGB as the included camera):
https://shop.luxonis.com/collections/modular-cameras/products/dm1090ffc?variant=40535310500021
Thanks,
Brandon