Here is says "If you're a student, an amateur or a professional looking to film in the Mile High City, here you will find all the information [permit applications] you need to get ready for your shoot."
Professional filming or photography (including digital imaging) of public property in Denver requires a permit from Special Events and Film Production. A permit from DPR is also required if the filming, photography or imaging takes place in any Denver park or park facility. Such a dual permit typically requires coordination with several offices, therefore a minimum of 72 hours notice is required.
Proof of Insurance of General Liability in the amount of $1,000,000 is required with a cancellation period of no less than 30 days. The City must be listed as additionally insured with the following statement: The City and County of Denver, its officers, officials and employees. Download Insurance Certificate information.
The application and insurance certificates will be faxed to the Denver Parks and Recreation Facility Use Permit Office at (720) 913-0778 for approval.