Video file server created based on solutions proposed by ant-thomas.
A few days ago I bought SMARTROL ZX-C23 camera on one of the Chinese portals and I missed the function of viewing video recordings directly from SD card. The whole trick is to swap several files, including uploading a newer version of the busybox, which has an HTTPD server.
Connection to the server is possible at http://IP:8080/cgi-bin/webui - where IP is the camera address assigned by the router.
All video traffic is not transmitted through external servers! However, I use several CDNs (Content Delivery Network) from where I get resources like jQuery or FontAwesome.
That's how it looks:
Live view:
Playback:
The site is responsive and can be successfully viewed on smartphones.