As it would not be for private use obviously, you would have to pay licenses for the tools used (fraps, avid, DigAS, whatever) and for the music. Then, if you do voiceovers, you'd have to rent a studio if you don't wan't your video to come across as one of those cheap internet prank videos...Stiler said:What money does it cost? (Unless you mean your time = money).
So, even if you have someone who would do all this for free (and producing/directing(editing videos on a professional level is not an easy thing, believe me), it would be quite pricey...