Whats that compositing thingie?

I searched but to no avail… What is that program, plugin, script, I don’t remember that helps you in compositing photos in blender? I might be really wrong on this, but it looked like it is something I really need. Has anyone found compositing tutorials for adding objects into scenes in a photo? I tried wierdhat and his concepts but I have a really hard time applying them to my situation. What I am trying to do is added a building into a photo of a streetscene and its stumbed me. Any help would be greatly appreciated. Thanks…

It’s called Blender. You can add the phota as a background (View >> Background Image) and enable that image in the render with the Backbuff button in the Output tab in F10…

Or you can add it as a strip in the Sequence Editor (Add >> Images) and use an AlphaOver (Add >> Effect).

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