Try the free version of NX-V first and check your cameras or NVRs work with the app.

NX-V PRO adds advanced features to the free version of the app.

1. Supports viewing NVR cameras as individual cameras or in multi-camera view
2. Access to remotely stored videos on FTP servers or SMB/NFS shared drives
3 Access to onboard recording and event history
4. Global recording event search across all cameras and storage types
5. Set your camera's GPS location and view a map of all your cameras
6. User management - add/remove and edit camera users
7. System features, view log and reboot camera
8. Sync camera settings, locations and groups between your iPads or NX-V PRO on your Mac
9. Digital zoom mode for cameras without optical zoom

Notes: 

Not all cameras support system admin or onboard storage and the available functionality varies by camera. 

The ability for the software to playback videos from onboard storage at the exact start time depends on how the firmware in the camera/NVR behaves.

If your camera or NVR provides individual replay URIs for each recording event the app will be able to play this back and capture the video stream to save to a local MP4 file.

On some devices no timing information is provided by the firmware making it impossible to move to the exact start time of the video.