Blender 2.80 tutorial: Render object wireframes using the Freestyle option in View Layers.  This tutorial quickly demonstrates how to setup and render basic, multi-colored  wireframes, and composite them over a background image.  Wireframe renders are helpful in evaluating matchmoves, or useful for illustration purposes.  

Correction:  2:00 The Silhouette option is not the proper method for rendering outlines from the viewpoint perspective.  'Contour' renders the outline of individual overlapping objects, while 'External Contour' renders the outline of all overlapping objects combined - similar to a Boolean Union operation.

Contents:

00:00 - Introduction and use cases
00:23 - Freestyle settings
02:59 - Wireframe compositing