This is how they do it. Driver puts the E-brake on which locks the rear wheels, then pushes down on the clutch and accelerates to probably 3000 to 4000 rpm, then swiftly releases the clutch. This causes the front wheels to lose traction in order to match the engine revs and so they spin. The friction from the spinning wheels pulls the car out, and once it’s past the cones, the driver releases the E-brake and away she goes.
Brazilian Policeman Learning How to Get Out of a Tight Parking Space