This is the 953rd most frequent Norwegian word.
istanbul
"Istanbul" is a proper noun and refers to the largest city in Turkey; it does not have a unique definition in Norwegian apart from being the name of the city.
In this sentence, 'Istanbul' acts as the direct object of the verb 'besøke', indicating the destination.
Jeg ønsker å besøke Istanbul neste sommer.
I plan to visit Istanbul next summer.
In this usage, 'Istanbul' specifies the origin of the movie as a location.
Se denne filmen fra Istanbul!
Watch this movie from Istanbul!
Here, 'Istanbul' functions as the subject of the phrase describing what people talk about.