I am new to configuring OpenWRT devices, and have a Qualcomm Atheros AP151 reference board with QSDK Wireless Router QCA9558.LN / LuCI 0.11.1 Release (0.11.1)

I have a NVR(Network Video Recorder) with an onboard LAN(DHCP - 192.168.*.*), connected to the QCA9558 board (Static - 11.1.1.1). 

By design the NVR LAN is on a separate network.  The Wifi of the QCA9558 board is designed to connect to cameras only, and does not supply internet to devices on that network.

My goal and reason for reaching out to you, is so I can configure the NVR LAN / QCA9558 as an Access Point(Range Extender)  I want the lan port on the NVR and QCA9558 to be on the same Network / subnet / gateway and not on a Vlan.

Could you please help by providing insight for me to accomplish this?