Windows 10
Unity 5.5.1f1
HoloToolKit v1.5.5.0
OpenCV for Unity 2.1.3(using OpenCVForUnityUWP_Beta3.unitypackage)

• Create New Project. (HoloLensWithOpenCVForUnityExample)
• Import HoloToolKit-Unity-v1.5.5.0.unitypackage. (excluding "HoloToolKit-Examples" folder)
• Setup HoloToolKit. (HoloToolKit > Configure > Apply HoloLens Project Setting)
• Import OpenCVForUnityUWP_Beta3.unitypackage.
• Import HoloLensWithOpenCVForUnityExample.unitypackage.
• Add the "Assets/HoloLensWithOpenCVForUnityExample/Scenes/*.unity" files to "Scenes In Build" list in "Build Settings" window.
• Add the "WebCam" to "Publishing Settings > Capabilities" checklist in the "Player Settings" window.
• Build and Deploy. (See https://developer.microsoft.com/en-us/windows/holographic/holograms_100)