Creates VTK render window with an interactor.

    :param actors: list of VTK actors
    :type actors: list, tuple
    :param callbacks: callback functions for registering custom events
    :type callbacks: dict

def create_render_window(actors, callbacks, **kwargs):
    """ Creates VTK render window with an interactor.

    :param actors: list of VTK actors
    :type actors: list, tuple
    :param callbacks: callback functions for registering custom events
    :type callbacks: dict
    """
    # Get keyword arguments
    figure_size = kwargs.get('figure_size', (800, 600))
    camera_position = kwargs.get('camera_position', (0, 0, 100))

    # Find camera focal point
    center_points = []
    for actor in actors:
        center_points.append(actor.GetCenter())
    camera_focal_point = linalg.vector_mean(*center_points)

    # Create camera
    camera = vtk.vtkCamera()
    camera.SetPosition(*camera_position)
    camera.SetFocalPoint(*camera_focal_point)

    # Create renderer
    renderer = vtk.vtkRenderer()
    renderer.SetActiveCamera(camera)
    renderer.SetBackground(1.0, 1.0, 1.0)

    # Add actors to the scene
    for actor in actors:
        renderer.AddActor(actor)

    # Render window
    render_window = vtk.vtkRenderWindow()
    render_window.AddRenderer(renderer)
    render_window.SetSize(*figure_size)

    # Render window interactor
    window_interactor = vtk.vtkRenderWindowInteractor()
    window_interactor.SetRenderWindow(render_window)

    # Add event observers
    for cb in callbacks:
        window_interactor.AddObserver(cb, callbacks[cb][0], callbacks[cb][1])  # cb name, cb function ref, cb priority

    # Render actors
    render_window.Render()

    # Set window name after render() is called
    render_window.SetWindowName("geomdl")

    # Use trackball camera
    interactor_style = vtk.vtkInteractorStyleTrackballCamera()
    window_interactor.SetInteractorStyle(interactor_style)

    # Start interactor
    window_interactor.Start()

    # Return window interactor instance
    return window_interactor