Can I use a virtual card to pay in person?

Technically, yes!

If the machine/store allows you to input the specific parameters that the virtual card has (full number, expiry, CVC), then it should work. However, this largely depends on the physical machine used by the store. Usually, you can ask the person working to take the transaction as if it was an over the phone transaction where they enter the numbers manually.

Typically, virtual cards are used for online purchases/subscriptions and physical cards are used for in store/person purchases.