How to Enable GPU Computation in Python Wrapper

[riven314]

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Required Info
Camera Model	D435i
Firmware Version	05.11.06.250
Operating System & Version	Win 10
Kernel Version (Linux Only)
Platform	Notebook (Lenovo Y740)
SDK Version	v2.25
Language	python
Segment	deploy in my own notebook

Issue Description

I mainly use your python wrapper for my own development. I installed sdk 2.0 here (https://www.intelrealsense.com/developers/).
I found that the current SDK viewer and the python wrapper only consume my CPU power, and I want to leverage my GPU computation. How can I enable GPU computation in python wrapper?

[MartyG-RealSense]

RealSense SDK 2.0 supports CUDA for graphics processing enhancement. If your GPU supports CUDA, you can use CMake to build Librealsense with CUDA enabled by using the build customization flag BUILD_WITH_CUDA which is set to False by default.

https://github.com/IntelRealSense/librealsense/wiki/Build-Configuration#build-customization-flags

An alternative to CUDA is GLSL processing blocks, which were added in SDK version 2.22.0.

#3654