Draw contours for determined landmark points ( OpenCvForUnity )

I training data for the specific points on the face. I can find landmark point and I can show that points on the unity webcamTexture but I want to draw contours on landmarks point that is determined by me. Firstly I need to convert landmark points to convex hull points for draw contour among existing points. How can I convert?

I tried

List<List<Vector2>> landmarkPoints = new List<List<Vector2>>();
OpenCVForUnityUtils.ConvertVector2ListToArray(landmarkPoints) ;

but landmark points doesn't convert.

I need to convert landmarkPoints to hull Points.

Imgproc.drawContours (rgbaMat, hullPoints, -1, new Scalar (0, 255, 0), 2);

Could you help me, please?

 

I found this solution, finally. If you have match same problem that answer could help you.

Code (CSharp):

1. // detect face landmark points.
2. OpenCVForUnityUtils.SetImage(faceLandmarkDetector, rgbaMat);
3. for (int i = 0; i < trackedRects.Count; i++)
4. {
5.   List<Vector2> points = faceLandmarkDetector.DetectLandmark(rect);
6.   List<Vector2> pointss = new List<Vector2>();
7.   //Draw Contours
8.   List<Point> pointsss = OpenCVForUnityUtils.ConvertVector2ListToPointList(pointss);
9.   MatOfPoint hullPointMat = new MatOfPoint();
10.   hullPointMat.fromList(pointsss);
11.   List<MatOfPoint> hullPoints = new List<MatOfPoint>();
12.   hullPoints.Add(hullPointMat);
13.   Imgproc.drawContours(rgbaMat, hullPoints, -1, new Scalar(150, 100, 5,255), -1);
14. }