So you want to use the camera just like a regular motion sensor to turn on lights?
The app should be able to do that just don’t select any routines or disarm etc. only turn on lights options. You can also write your own custom app or use any smart app from the marketplace / community which turns on lights when there is a motion event. Many apps do that or you can use rules machine or trigger happy to do it.
As for push notifications you should ask Foscam. I’ve requested them add that feature to their HD cameras. Currently only their SD cameras support push notifications. Interesting this something they can re add with just a firmware update.