In the presented situation, do you have priority over the vehicle on the right?

Why?

At the start of the video, the entrance has both an A-7 give way sign and a C-12 roundabout sign. At the moment in question, you are already on the roundabout, while the silver car on your right is entering it. With this combination of signs, that driver must give way to you.

§ 36 ust. 2 rozporządzenia w sprawie znaków i sygnałów drogowych