Before dimming your problem simple, you might want to consider providing a more thorough description of what exactly you want to achieve. Using a framework where you can do 2D/3D rendering with raw OpenGL or more sophisticated high level classes as well as video rendering, asking how to show a 2D/3D scene is not exactly the same as asking how to show two videos showing 2D/3D scenes.
Therefore, can you explain exactly what your application is about and what exactly you are trying to show ?
On a side note, criticising all the moderators when only one of them answered you, trying to help you with the limited information you gave, isn't really a good attitude.