Xolotl Studio shows how you can create projections with Octane in Blender.

If you need to match your 3D scene to an image, a camera projection is a way to go. This new tutorial from 

Xolotl Studio shows how easy it is to create this setup when using Octane render in Blender.

There aren’t many tutorials out there for camera mapping or projections in Blender, but CGMatter had a good one that showed how you could clean up shots by projecting an image with a camera projection.