Attention: Old PyARTK module is obsolete for a long time. Now the new ARTKBlender module is available. It works on current version of Blender and provides similar functionality as old one. PyARTK is Python wrapper for ARToolKit. I used it to integrate ARToolKit with Blender Game Engine.
Attention: This module is obsolete. Current version of Bledner contains VideoTexture module created directly from this one. GameBlender Texture plug-in allows to update textures in GameBlender from various sources (video files, live video from camera devices, static images files or rendered 3d scenes) during gameplay.