Public Records: How to Request Dash Cam Footage from a Police Vehicle

My question involves a traffic ticket from the state of: CA

I went to the police department to request the footage, but the record staff told me I can only request it through filing for discovery, that is if I choose to contest the ticket. But I want to review the footage before deciding whether to go to court. Can I request the footage through FOIA? If so what is the process?
Thanks for any response.

Public Records: How to Request Dash Cam Footage from a Police Vehicle