I modified the function "cheese_window_cmd_about" as following snippet code, and launching About dialog works properly.
Modify "gtk_show_about_dialog(GTK_WINDOW (cheese_window->window),....." to "gtk_show_about_dialog(NULL,....."
I modified the function "cheese_ window_ cmd_about" as following snippet code, and launching About dialog works properly.
Modify "gtk_show_ about_dialog( GTK_WINDOW (cheese_ window- >window) ,....." to "gtk_show_ about_dialog( NULL,.. ..."