Are you obliged to give the right of way to pedestrians on a yard with no designated pavements and road?

In the video, you are entering a yard where there is no separate roadway and no pavements - pedestrians are walking on the same surface that you are driving on. In such a place, you are obliged to drive slowly and give way to pedestrians, just as when you cross a pavement.

The Road Traffic Act requires a driver crossing a footway (droga dla pieszych) to drive slowly and give way to pedestrians, and the same rule applies accordingly when driving in a yard where, because the roadway and footways are not separated, pedestrians and vehicles move on the same surface. So you drive at a speed that allows you to stop at any moment, and you let through everyone who is walking across your path.

Legal basis: Art. 26 para. 4 and 5 of the Road Traffic Act (Prawo o ruchu drogowym)