Documentaries: "...stunning documentaries and educational films." → The adjective describing documentaries is stunning.
Musicals: "This hugely popular musical has imaginative costumes and dazzling special effects." → The adjectives describing musicals are hugely popular, imaginative, and dazzling.
Special effects: "This hugely popular musical has imaginative costumes and dazzling special effects." → The adjective describing special effects is dazzling.