Mostly a problem for the Sydney Traffic Manager and/or SACL. For things like cranes, SACL organising the approvals and restrictions/requirements for their operation. I have seen a couple of balloons (ones for taking photos of real estate etc) treated in the same way and are generally OK up to 300' (or so?) as long as they are not right next to the airport.
If it is for advertising or similar they will generally not be approved if they interfere with the airport's operations, but if they are something like the new signage on centrepoint, or special media requirements for a short period, the traffic can be managed via NOTAM and then the appropriate runway selection and/or departure tracks.
As for the Coogee beach example, considering how far it is from the airport, I would imagine SACL would have approved it to operate up to something like 300' with no traffic management required. But that is just an educated guess from my experience.
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