Good morning, Bushwhacker.
(1) I do not think that you can use "nowadays" as an adjective.
(2) I think it is preferable to say:
Present-day American cinema is winning many international awards.
Current American cinema is more concerned with entertainment than discussing serious problems.
(3) I think you could use "nowadays" as an adverb:
American cinema nowadays is starting to touch on many taboo subjects.
OR with a comma:
Nowadays, American cinema is facing stiff competition from filmmakers in other countries.
Have a nice day!
Student or Learner