If you read it silently you might misinterpret somethings, or maybe think it’s saying something completely different because you can’t see or tell how the reader is reacting. Or the way they were trying to portray their message.
But if it is read to you (or you watch the video) you will be able to see and tell how it is portrayed and get a better understanding.
Narrative is the choice of which events to relate and in what order to relate them. From this I would say that you could look for parts in the story where certain language is used and words that are used that fit the “gothic” part of the story. Search for words that connects to that.