For deepstream gaze app, it is still developed by deepstream team ongoing for this gaze visualization feature. It will not be available in short term. Maybe two or three months later.
BTW, you can also leverage the code in samples/tao_cv/demo_gaze/
root@xx:/workspace/tao_cv-pkg# ls samples/tao_cv/demo_gaze/
CMakeLists.txt Demo.cpp VizUtils.cpp VizUtils.hpp anthropometic_3D_landmarks.txt demo.conf gaze