How to make it convenient to view the received data from CCTV cameras stored on a remote server (NAS)?

Question

User interface

There are several different cameras that are configured to upload video clips to a remote NAS (ftp) server when motion is detected.
It is necessary to get convenient remote access to these video streams, sorted by time, date, events ... Actually, as it is implemented in any video surveillance system. Only it is necessary to work with ready files.
On the server, the data is stored in dav and mp4 formats. Anyone can access the server.
Ideally with access from the android application.
You need a READY, preferably paid with support, solution in the form of a script or service. Ideally under linux.

Answer 1

Plex.

Answer 2

Create a website.

Answer 3

Buy a tracer. Install on a server. Write at the expense of his camera. Write on ftp etozh ppc ...