In this situation, can you make a U-turn at the intersection?

Why?

At the end of the video, the directional signal displays green arrows permitting both a left turn and a U-turn. You may make a U-turn because the signal specifically allows this manoeuvre. A left-turn arrow alone would not permit a U-turn.

§ 97 ust. 1 rozporządzenia w sprawie znaków i sygnałów drogowych