Is the PBO created within the Vizard OpenGL context or a separate context? Either way, it seems inefficient to download the data from a PBO and copy it into a texture then upload it back to the graphics card. Ideally you would want to get direct access to the video source and copy it into the Vizard texture.
Does the video camera provide some sort of API for accessing the data? If so you could create a Python extension that accesses the data and returns it to your script. From there you could use the texture.setImageData command.
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