In this situation, are you obliged to stop the car at the indicated place?

In the video you are driving along a street through a district of detached houses, and a uniformed police officer with a stop disc (tarcza do zatrzymywania pojazdów) is standing on the roadway; he signals you to stop and points with his hand to a place by the edge of the roadway. In this situation you are required to stop the vehicle at the place indicated. The answer is: yes.

The Road Traffic Act requires a road user to obey instructions and signals given by persons authorised to carry out traffic checks, and the Regulation on road signs and signals states that the signal to stop a vehicle is given with a stop disc - a red circle with a white border - and a uniformed police officer may, in good visibility, also give it with his hand alone. You stop at the place he indicates, switch on your indicator, switch off the engine only when told to, and keep your hands on the steering wheel while waiting for the officer to come over.

Legal basis: Art. 5 para. 1 and Art. 6 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym); § 109 para. 1-3 of the Regulation on road signs and signals