I have got the camera image using
https://developer.vuforia.com/library/articles/Solution/How-To-Access-the-Camera-Image-in-Unity
after doing some tests on it
I noticed that getting the target corners using this example
https://developer.vuforia.com/forum/faq/unity-how-can-i-get-target-screen-coordinates
then trying remap it on the raw camera image doesn't work at all.
because the camera image is getting clipped and changing it's scale before using it on the screen
so my question is there a way to mape my target coordinates on the raw Image I get from the CameraDevice.GetCameraImage ??