The Voltigeurs de Québec Armoury building (in the heart of Old Quebec) Plate Cleaning, Building masking, sky replacement, snow added (remove streets and signs), set extension (castle), and color grading!
Parallaxe done in Nuke, with 3D Geometry (Blender)
Breakdown
2,5 parallaxe, Projection in Cards in Nuke, and Geometry created in Blender