I couldn't see the video at all... here is a written response to that.
Go to Xbox.com.
At the bottom of your screen (grey bar), click on *United States* (Or whatever country you are in, it should be the very bottom left).
Change that to Brasil.
Then go [here](https://account.xbox.com/pt-BR/PaymentAndBilling/RedeemCode?xr=shellnav) and redeem your code (If you were having issues you should have this memorized lol)
Then you are done!
(PS don't forget to change it back to your country again!)