There are many ways to go about this.

You could bring the live video into Poser (say on a vertical plane) and set up your camera and figure to match the shot.  Then you could render the figure animation with a simulated 'green screen' (as Poser doesn't have alpha in render as far as I know - may be possible in Poser 6).  Then you would need software capable of turning the green into an alpha for matting over the live video.

Or, you could do the animation render in Poser with the live video playing to get the result all at once.  The problem is that Poser is not the fastest renderer around - best to do still images out to file and concatenate them into a video using the appropriate software in this case (QT Pro, FC Pro, Premiere, etc.).

Or, if you have another 3D package such as LightWave, Maya, XSI, Cinema 4D, Carrara, or anything that has some sort of support for importing Poser animated scenes, you could do the rendering there.  You may have the alpha render choice or be able to mix the live and animation for render with much fast results.

Note that for WinMorph that beryld suggested, you will need to render the animation out as stills or movie format to do the morphing between videos.  Again, depending upon the time span, complexity, and desired realism of the Poser animation, it may take a long time to render in Poser.  You'll have to see what options you have or can afford.

Robert

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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