In the scenario presented, when approaching an uncontrolled intersection, do you have priority over the rail vehicle travelling from the opposite direction to the left?

In the video you are driving in a town and approaching an uncontrolled junction of equal roads with tram tracks running through it; a tram turning left is coming from the opposite direction, which means it is crossing your path. You do not have right of way over it. The answer is: no.

The Road Traffic Act states that the driver of a vehicle, when approaching a junction, gives way to a vehicle from the right, and when turning left - also to a vehicle coming from the opposite direction; however, this rule does not apply to a rail vehicle, which has right of way over other vehicles regardless of the direction it is coming from. At an uncontrolled junction of equal roads an ordinary car turning left from the opposite direction would have to let you go, but a tram does not - its right of way comes from the Act and applies to a vehicle from any direction, including one going straight on. The exceptions are situations where right of way is decided by signs or traffic lights, or when a tram is joining traffic from a turning loop. Here, as the question says, the junction is an uncontrolled junction of equal roads, so the tram turning left across your lane goes first - you slow down and stop before the tracks, leaving it room for its curve.

Legal basis: Art. 25 para. 1 and 2 of the Road Traffic Act (Prawo o ruchu drogowym)