Real time rendering on Windows 11 with Intel GPU

[shaharyuval]

I'm trying to overlay my webcam output with a rendered mesh and am using Open3D for this purpose.
The target platform is a Windows 11 laptop with an Intel integrated GPU.
I have tried following instructions for headless rendering, but it appears this is not supported for Windows?
I have resorted to opening a visualizer windows and capturing its contents, but the frame rate is an abysmal 2 fps. Is there a better way of doing this?

Here's my code:

        vis = o3d.visualization.Visualizer()
        vis.create_window(window_name='Angel Visualize', width=face_w, height=face_h, visible=False)

        vis.add_geometry(mesh)
        vis.poll_events()
        vis.update_renderer()
        rendered_face = vis.capture_screen_float_buffer(do_render=True)
        rendered_face = np.array(rendered_face) * 255
        rendered_face = rendered_face.astype(np.int16)

        depth_map = vis.capture_depth_float_buffer(do_render=True)
        depth_map = np.array(depth_map)
        vis.destroy_window()

        out_img = img.copy()

        offset_x = 100
        offset_y = 100
        out_img[offset_y:offset_y+face_h,offset_x:offset_x+face_w,:]=(depth_map[:face_h,:face_w,np.newaxis]==0)*img[offset_y:offset_y+face_h,offset_x:offset_x+face_w,:] + (depth_map[:face_h,:face_w,np.newaxis]!=0)*rendered_face[:face_h,:face_w,:]