Adding a collider on a list of vectors - unity3d

Question

I'm trying to detect contours in a scene and add a collider to every detected object, I used the canny edge detector to get the coordinates of the detected objects.
Here is my output image
I need to add a collider to each black line to prevent my game object from going in/out of that area but I don't know how to do so exactly.
The findContours function returns a list of detected contours each stored as a vector of points but how do I use that to generate a collider?
Thank you for your help.
Update
Here is my source code (for the update method)
void Update ()
{
if (initDone && webCamTexture.isPlaying && webCamTexture.didUpdateThisFrame) {
//convert webcamtexture to mat
Utils.webCamTextureToMat (webCamTexture, rgbaMat, colors);
//convert to grayscale
Imgproc.cvtColor (rgbaMat, grayMat, Imgproc.COLOR_RGBA2GRAY);
//Blurring
Imgproc.GaussianBlur(rgbaMat,blurMat,new Size(7,7),0);
Imgproc.Canny(blurMat, cannyMat, 50,100);
Mat inverted = ~cannyMat;
//convert back to webcam texture
Utils.matToTexture2D(inverted, texture, colors);
Mat hierarchy = new Mat();
List<MatOfPoint> contours = new List<MatOfPoint>();
Imgproc.findContours(inverted, contours, hierarchy, Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE);
}
}

Answer 1

Use a PolygonCollider2d.
You can edit the collider at runtime using the SetPath function, to which you will pass a list of 2d points (that you already computed using the findContours function.
You can have several paths in the polygon if you want your collider to have holes.