There is no Zoom feature as you may think on the P3P. However, some software packages can adjust the video in a way that it looks as if you zoomed in. It's a 4K camera, so the results should be good if it's shot in 4K.
What is a 2X Digital pinch and how do I get my P4 to do it? When in 2X, can I st ...
To zoom on the P4 just use two fingers on the screen and pinch out to zoom. Zoom is not supported in 4k. You can be in 4k but have the slider to Photo and you can zoom.
There is no optical zoom feature available in the Phantom 3 Pro drone, but you can use many other awesome image/video editors for zoom effects without losing the quality.