How can I pull applications windows into unity like: "Virtual Desktop"?

What I'm trying to do specifically:

1. Open a program on my desktop(Bluestacks, it's an android emulator).
2. Play with the program inside Unity using the Vive controllers as my mouse.
3. Ex: Play a life size mobile game using my whole body not my thumbs haha!

I thought this should be a peace of cake since SteamVR as well as a few steam games have a version of this implemented into their runtime environment but I can't seem to find any info on the web.

-Any help is appreciated