filmasen
-they filmed
The word filmasen is the imperfect subjunctive form of filmar in the third person plural.
See the full filmar conjugation

filmar

Según una persona que conoce bien el tema, sería de gran ayuda que los medios de comunicación búlgaros filmasen las prácticas corruptas que se producen en la frontera.
According to one person in the know, it would certainly help if the Bulgarian media were to film the corrupt practices that go on at the border.
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