Something similar to Unity3D's WebcamTexture?

Is there something similar to Unity3D’s WebcamTexture. Trying to achieve a background (textured to a Quad) with a feed from a webcam with the 3D layered on top, e.g. AR.

I am looking for how to do this, too. One other user succeeded by including a C++ library, I think, and feeding its data into a Dynamic Texture on the render pipeline for the Canvas. Something like that.