Supervised image foreground and background segmentation

Dear Image processing expert, Need for opencv c++ based image processing solution to segment foreground and background of images. Input image will be always contain human's face; and that face will be marked. The foreground of the image need to be segmented that includes the body of the human and objects that is supposed to be in the foreground. Please see the attached example. input image -> [login to view URL] input mask -> [login to view URL] expected output mask -> [login to view URL] The solution need to be robust and work with photos from different cameras and different lighting conditions. For every case, the face will be marked and provided as input. Thankyou