You can't get any other camera at all that is compatible with the P3 or P4.
No .. this is not
to stop perverts spying on people.
There are big technical issues that make it difficult to use a zoom lens on a small drone.
Even on a bigger drone that can carry more weight like the Inspire with the X5 camera, its zoom has a very short range.
A lot of people confuse zoom (variable focal length) with long telephoto.
If you paid the big money for an
I2 with X5 and zoom lens, iIt's the Olympus14-42 which is the 35 mm equivalent of 28-84mm so it will give moderate wideangle to short portrait.
It's still not going to be of any interest for perverts or wildlife photographers.
The issues of the weight and size for big tele zooms and the problem of vibration being magnified by the telephoto lens are preventing using telephoto lenses on drones and having good image quality.