Need more info than that. No problems on my G3 running CM12.1.
What Xposed did you use? I stick with good ole v87.
You can try the UNITY installer and see how that goes.
Try to use third party camera app like footej camera/cameringo I use it on my 4013k running on ViperOS 3.1.1 nougat (MicroG/NoGAPPS Setup)
Don't worked, finally i changed the rom to AmberRYA 4.4, it isn't as good as the CM12.1 but works better/mo...