This is the 3351st most frequent Turkish word.
kameraları
"The cameras" (plural form).
In this sentence, 'kameraları' is used to refer to the specific cameras (the security ones) as the object in a possessive context.
Güvenlik kameraları binanın çevresine yerleştirildi.
The security cameras were placed around the building.
Here, 'kameraları' indicates the cameras in question as the direct object being acted upon (hired), maintaining a possessive nuance.
Film çekimi için profesyonel kameraları kiraladık.
We rented professional cameras for the film shooting.
In this usage, 'kameraları' again shows possession (the cameras in question) and is employed in the accusative case for the object of the action (carried).