Please, I need your help. I am working on compositing real life image with Blender generated images. I have been able to CORRECTLY track the camera with Voodoo and successfully imported into Blender but when I add my virtual image which in this instance is a car, it does not show up in the rendered image even though it is showing in the screen shot. A screen shot and the rendered image of the project in question at frame 950 is attached if it help help make my question clearer 

Can anyone tell me what I am doing wrong. I even added a simple ''CUBE'' in the scene, yet it did not show up in the rendered image.

 

I think I should add for clarity that when viewing the screen shot, I am in the Camera view (Numpad 0)

 

THANKS