you have to get a reference of that object, one easy way is to put a tag on it such as player then if you have a target variable on the camera then make it find it by tag as example:
target = GameObject.FindWithTag(“Player”).transform; that is assuming that the target variable is a transform type.
keep in mind this is pseudo code so i might of mispelled it, if you copy and paste it might not work. so make shure you have it typed correctly.