Question regarding moire on 6D
Can you supply links?
I have the impression that the 5Dmk3 actually reads all of its sensels, does a software downscale before saving as 1080p video frame.
The 5Dmk2 used a simpler approach where only a subset of sensor lines were read, and more or less directly saved as video frame (after some unknown debayer algo).
If the 6D is more like the 5Dmk2 (perhaps due to sensor read-out speed), then I dont think that any software fix will generally be able to cure all aliasing problems. Using a large aperture (diffraction blur) and avoiding scenes with high-frequency periodic patterns (like roofs, fences) might be your best bet.