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I have written two sets of code in C. One is using OpenCV (for marker detection) and another OpenGL (for creating a simple 3D box).

But I have no clue how to integrate those two. For example: Displaying the box on detected maker.

With the functions of OpenCV such as cvFindExtrinsicCameraParams2,cvRodrigues2 I have obtained the rotation vector and rotation matrix. But I cannot understand how I can pass these points to OpenGL so that it can draw a 3d shape on the detected marker?
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Sounds to me like a job for gluUnProject.

Here's the docs: gluUnProject[^]
Here's a quick demo: Nehe's advice for using gluUnProject[^]
Another 'using gluUnProject' page[^]

Presumably, you can substitute the talk of mouse cursor position for that of openCV returned co-ordinates. (I Haven't used openCV or gluUnProject before)
 
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