A quick check of the parkweb.vic.gov.au website under Licenses and Permits / Filming/Photography indicates a permit is required for all drone/UAV/RPA usage even drones under 2Kg. If a permit is to be obtained you will require evidence the operator is CASA certified!! It would appear Parks Vic may not be keeping up with CASA. Hopefully common sense may prevail when dealing with local Parks management. I suggest a phone call to discuss, with plenty of lead time, with local park management and see how you go.