Follow Mouse Camera Space

 Vector2 movePos;
            if (RectTransformUtility.ScreenPointToLocalPointInRectangle(
                targetCanvas.transform as RectTransform,
                Input.mousePosition, camera,
                out movePos))
            {
                Vector3 mousePos = targetCanvas.transform.TransformPoint(movePos);
                cursorRectTransform.position = mousePos;
            }