You may be able to improvise music to play along with a piece of media, or even get by without writing it down. However, reading and writing music will be very helpful for you in this career path.
Many different types of media have scores and compositions that you can listen to. Try to sample TV shows, video games, and classical pieces to broaden your horizons.
Depending on the budget a composer has, they can sometimes use a live band instead. However, that is not the norm.
You will also learn how to use an orchestra to accompany a film.
You may want to give your degree a focus as you determine what specific career path you want to take after you graduate.
Choose videos and compositions that are your best work to impress your potential employers.
Even if you don’t live near any large film studios, you may be able to find remote work from your computer.
Be wary of jobs that pay nothing at all, or promise to give you exposure. Your time is valuable, and you should be paid for your work, even if you are just starting out.