Like let say that I have a video of 352x480 and I want that video go to 720x480..is that possible? thanks
Sure. A lot of apps will have built in resizers. Otherwise frameserve with AVISynth. lanczos4resize(720,480), etc.
Sure you could do that, but you then enter into fuzzy world, with halo's and graininess. Almost all converters will allow you to change the res.