Controlling ipad ios camera transmitted video e.g. zoom/pan/contrast/colour saturation

The picture from my ipad camera is far too wide/high/colour shifted in Zoom. 

I want to be able to change the video size etc. input to Zoom and transmitted to the meeting.

On my Mac Air I use an app called iGlasses. This picks up the camera feed, changes it in to a virtual camera which I can configure in a zillion ways, then Zoom uses the virtual camera.

How can I do something similar in Zoom on iPad iOS?

I would even be willing to purchase an external camera and/or app if need be.

Best would be if I could do this within Zoom.

(No one seems to have a clue at e.g. Logitech or Zoom how to do this very simple operation)