Render with quality in HD

I just wondering how to restore dvd video and render with very good quality in sony vegas, i just using neat video and others plugins, i used boris uprz to upscaling to 720p, but i saw some pixels, i really want a clean and very good image that i saw trough in youtube, how they do? Like bjork or radiohead stuff like this




or radiohead:






if you know how to do this with this quality please teach me!! than you so much for while!