As Matt has said there are very few software programs for the Amiga if any that will do that sort of job.
The Video Toaster will do this but not at 1600x1200 unless you render it in Lightwave. You can blow up the image using a program like Art Department Pro but its very hard to find I have it and it will do the job but of course it still just adds the missing pixles to the 320x480 video capture that the Toaster captures at.
