A simple Unreal Engine 4 plugin that allows to have extra game windows with their own camera viewpoints.
Tested with and compiled for Unreal Engine 4.12.5
This plugin adds a new actor class called "ExtraCamWindowActor" which is derived from CameraActor. To use it, simply copy the "Plugins" folder into your game project root directory and then put an ExtraCamWindowActor into your scene. Note that the extra camera window has a serious performance impact as the scene is rendered another time.
The plugin also adds Blueprint functions to add and remove widgets from the extra window viewport (AddWidgetToExtraCam and RemoveWidgetFromExtraCam).