// Initialize Vulkan
    ...

    // Initialize ImGui
    ImGui::CreateContext();
    ImGui_ImplGlfw_InitForVulkan(window, true);
    ImGui_ImplVulkanHpp_Init();

    // Rendering loop
    while (true) {
        // Render 3D Objects
        ...

        // Start ImGui Frame
        ImGui_ImplVulkanHpp_NewFrame(physical_device, device);
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();

        // Create ImGui window
        ImGui::ShowDemoWindow();

        // Render ImGui (Stack commands on `imgui_cmd_buf`)
        ImGui::Render();
        ImDrawData* draw_data = ImGui::GetDrawData();
        ImGui_ImplVulkanHpp_RenderDrawData(
                draw_data, imgui_cmd_buf, swapchain_img_view,
                swapchain_img_format, swapchain_img_size);

        // Submit ImGui Rendering command
        ...

        glfwPollEvents();
    }

    // Clean up ImGui
    ImGui_ImplVulkanHpp_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();