this project giving error in unity 2017.4.1f1

[Kingkong302]

Error are
1)Assets/VuforiaWithOpenCVForUnityExample/CameraImageToMatExample.cs(5,7): error CS0246: The type or namespace name `OpenCVForUnity' could not be found. Are you missing an assembly reference?

2)Assets/VuforiaWithOpenCVForUnityExample/PostRenderToMatExample.cs(4,7): error CS0246: The type or namespace name `OpenCVForUnity' could not be found. Are you missing an assembly reference?

3)Assets/VuforiaWithOpenCVForUnityExample/CameraImageToMatExample.cs(23,5): error CS0246: The type or namespace name `Mat' could not be found. Are you missing an assembly reference?

4)Assets/VuforiaWithOpenCVForUnityExample/PostRenderToMatExample.cs(16,5): error CS0246: The type or namespace name `Mat' could not be found. Are you missing an assembly reference?

5)Assets/VuforiaWithOpenCVForUnityExample/PostRenderToMatExample.cs(21,13): error CS0246: The type or namespace name `Size' could not be found. Are you missing an assembly reference?

6)Assets/VuforiaWithOpenCVForUnityExample/PostRenderToMatExample.cs(22,13): error CS0246: The type or namespace name `Mat' could not be found. Are you missing an assembly reference?

Please help me out.

[Darshandegr8]

You need to buy the asset called opencvforUnity