Is it possible to somehow render an image in TF2 so that you can get an higher resolution than your native monitor res?

For instance, when you model something in Maya and want to get an image of it, you can choose whatever size you want the final result to be, no matter what your monitor size is.

Is there any way to do this in TF2?

Basically, I want to fake motion tracking by getting a big image that just scrolls through the video frame, to make it look like it's an actual movie file with a camera that moves through the scene, so I can add text in After Effects and such.

I could just take a screenshot and make it bigger than the video frame size, but I'd rather not lose image quality that much.