That's not a pivot turn. A pivot turn is when you turn in place, thus not moving in a circle. Most older tanks are incapable of doing it.
Edit: I should add that I don't expect kindergarteners to get it right. I'm saying it to make sure people here don't learn the wrong thing.
Edit 2: It appears that turning in place is only today called a pivot turn. Originally it was called "neutral steering" and a pivot turn was when you locked one track. After a quick search I found this: http://forum.worldoftanks.com/index.php?/topic/219518-pivot-turn-what-is-that/ Scroll down to the comment by The_Chieftain. He's a big autority when it comes to the history of tanks.
Updated
*TURN*It's the P40.It's the pivot turn!Sure!*TURN**TURN**TURN*Wanna play?Let me join you!Chiyomi-chan!The pivot turn!