Under "C:\Program Files (x86)\Intel\PCSDK\bin\win32" there is "segmentation_viewer.exe"
The source code for this is in Visual Studios C# in "C:\Program Files (x86)\Intel\PCSDK\framework\CSharp\segmentation_viewer.cs"
However, they do not include an example of segmentation_viewer for Unity. All they seem to have is a version for Unity with a lot less functionality than the Visual Studios C# version.
In order to do segmentation, the VS C# version has UtilMPipeline with a function "EnableSegmentation" among other very useful functions.