Are you talking about a moire in your subjects or foreground? Often there is a moire or pattern noise caused by large sensor cameras because of the enormous resolution they have which is often more than you need for an HD production. 

Yesterday I was working on a project shot on Epic 5K and a sweater a woman was wearing that had a certain patter that caused a moire. Often the moire shows up at a certain focal length where the pixels on the sensor match up with the pattern so zooming in our out with the camera will affect how the patterns causes noise, just like a photograph in AE that is made up of dots... at a certain scale the photo goes nuts.

Anyway, my fix yesterday was to change the resolution of the image and presto the moire was gone. Instead of using the full 5K image for the shot I dumbed down the image to half resolution, still more than enough for HD television and the moire disappeared. Now I did this in Davinci Resolve where I have quick access to Raw controls and resolution of the image but the same could be done in AE.

If this doesn't work I usually grab onto the area in question, again usually in a colour correction application like Resolve and do a slight blur of the pattern that is causing a moire.