Uh... yes you can:

  Glib::RefPtr<Gtk::Application> app = Gtk::Application::create("");

  Gtk::Window window;
  window.set_default_size(1366, 768);

  WebKitWebContext* context = webkit_web_context_new_ephemeral();
  WebKitCookieManager* cookies = webkit_web_context_get_cookie_manager(context);

  WebKitWebView* widget = WEBKIT_WEB_VIEW(webkit_web_view_new_with_context(context));
  Gtk::Widget* wrapper = Glib::wrap(GTK_WIDGET(widget));
  WebKitSettings* settings = webkit_web_view_get_settings(widget);

  Gtk::Box layout(Gtk::ORIENTATION_VERTICAL);
  window.add(layout);

  webkit_web_view_load_uri(widget, parse_address(argv[1]).c_str());

  window.show_all();
  app->run(window);
  exit(0);

Done.