Banks work with USD, EUR and other currencies.

I guess that there are services that convert automatically BTC into fiat, but the fees would be pretty big.
Instead, you can use an exchange to convert, then withdraw from there.
Or you can use the services of "bitcoin debit card" providers, where you transfer the bitcoin into a certain wallet and from there convert into the card's currency the amounts you want, when you want to.

But for all this to be unlimited you'll have to provide the exchange or the card service provider some papers about your identity.


Shortly: you need to identify yourself and I think that it will not be exactly automatic.