Think about it what you just asked for a moment.
Those voices do not exist in the game. The commentary you hear in the game is not just taken from broadcasts of actual games or something and slapped into the video game- it is professionally recorded and Marv and Kerr get payed alot (I assume) to do it. There are multiple different audio tracks from both commentators that play at specific times...So you basically just asked if we can record hours of game-quality voice from people we don't have access to and program them to play at the exact right time during your game? It takes alot to get them to say "Stoudemire is the leading scorer, he's leading the Suns with 21 points at the end of the 3rd quarter". That is at least 6 different lines of recorded voice put together in just that short statement.
I'm not sure why you thought this would be possible, but sorry- it's not.
