What? how bacteria use this structure to get a movie?

How about:
Next, we need to understand how bacteria use this structure [in order to fulfill our goal of getting] a movie of how antibiotics resistance genes are moved around.

Much closer to your second suggestion. But they aren't saying "We need to make a movie." Rather they are saying "We need to do this in order to make a movie."

Cool.
Thank you.

Will they really want to make a movie in reality? Or does the word movie here refer to "vividly dynamic process"?

I think they at least want to be able to envision the process in their mind. In that case, it would be an imaginary movie, but still one that involved a moving picture.

But sometimes scientists produce actual animations of such processes for display on a screen. So it is possible that they are referring to making an actual movie.

I lean slightly towards it being an imaginary movie -- just them envisioning how the process takes place. However, the article wasn't entirely clear on that point.