Yes, you can record 4K videos with Nokia 7 Plus at 30fps.
Yes, Nokia 7 Plus does have the dual VoLTE support.
No. Nokia 7 Plus does not have the Optical Image Stabilization but it does have Electronic Image Stabilization.
No. Nokia 7 Plus does not have the notification light. But it does have the ambient display, so you will always get alert on the display.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.