Hi, Rebecca!
As JL_JL(Jeff) suggested, CLPV will do exactly what you want. It achieves this by trimming(cropping) a little from the top and bottom of the image(not too much) then stretching the image out to(not quite) the left and right sides of the screen. The method used at least guarantees that anyone appearing in these videos doesn't look as if they've been "raiding the refrigerator"(late-night pig-outs!). I've been using the facility myself, available from, as far as I'm aware, PD version 8(though it could've been available in PD Version 7), to process a lot of old VHS and Video-8 or Hi-8 camera tapes. A bit of "touching up" with the fix/enhance facility and(almost) no-one would be able to tell the difference between a modern digitally-shot video and one sourced from these old analogue sources, though what might give the game away is if the audio was only mono, which, in many instances, it would be. But if you had stereo cam-corders, the deception could work well and you could tell your unsuspecting friends and relatives:
"Oh yeah! Sure I shot this with a digital cam-corder" while keeping fingers crossed behind your back! Ha-ha!
Cheers!
Neil.