Is it possible to do a cash back transaction in a store from a visa credit card?
it is possible, but I don't know of any place that would do that for you. Merchants generally have to pay around two percent on every Visa transaction, so they are not likely to give you any cash back. It also puts them at risk of losing the money if you dispute the transaction.
You can do it using a debit card.
If you have a PIN and a cash advance limit, you could get funds at an ATM or with a teller at most banks.