Film and TV production is in crisis in Poland. There aren't the budgets for original production that there were a couple of decades ago, and things shot on location here use the same few tech teams and extras. Screenwriting is of course in Polish and commissioned as and when needed from the same few people. People training on the technical side tend to look abroad for work.
will I need Polish?
Very much so.
I'm *not* a native English speaker.
If you don't have any qualifications and experience in teaching, you'd be looking at the very bottom end of the industry. Being non-native would also remove any element of luck in finding something better than that.