Is there anyway I can get in contact with a park administrator or security to access cameras from the parking lot?

There used to be a police hub there but I'm not sure now. The police station isn't too far away . Maybe you should talk to them . they would know what and how you need to get what your asking for.

I am sure thefe is but i do not know the processr

You can find there phone number online .

I would say go to the recreation building on a day when they are open normally a little bit before school gets out.

Call Parks and Recreation from El Cajon