Different Cameras on different Viewports ? Blender 2.8 How to get this different cameras in different viewports in blender 2.8? 

From docuemntaion:
"Local Camera
Active camera used in this view to override the (global) scene camera. The option is available only when lock local camera and layers toggle in the header is not" 
enabled.

Where is this option lock local camera...?
In sidebar options (N button) you have to select Use Local Camera and select your camera. See image.