I watched that video, and it had a few interesting tidbits. I knew that Stalingrad was big, but I didn't realize that it was that big.
However, the numbers in this video seem larger than numbers I see elsewhere. The video reports "half a million Nazis died", plus roughly 100,000 POWs. But the numbers in other sources show the figures as being much lower:
http://necrometrics.com/battles.htm