A system that analyzes camera images to track a person from a point where the person obtains an authorization to a different point where the authorization is used. The authorization may be extended in time and space from the point where it was initially obtained. Scenarios enabled by embodiments include automatically opening a locked door or gate for an authorized person and automatically charging items taken by a person to that person's account. Supports automated stores that allow users to enter, take products and exit without explicitly paying. An illustrative application is an automated, unmanned gas station that allows a user to pay at the pump and then enter a locked on-site convenience store or a locked case with products the user can take for automatic purchase. Embodiments may also extend authorization to other people, such as occupants of the same vehicle.