I was curious if i can use a VPS with small HDD to serve large videos from folder on an remote server. And it appears it is possible thanks to SSHFS or NFS (yet there can be obstacles on outdated OpenVZ virtualization). This is about NFS.

Installation on the client and on the server:
deb: sudo apt install nfs-common
rhel: yum install nfs-common (says: "No package nfs-common available."? try: yum groupinstall "Network file system client" )

just use NFS

mount -t nfs IP_OTHERSERVER:/path/to/folder OTHERSERVER

also, you need to install nfs-server on OTHERSERVER and edit /etc/exports file
Source: http://www.linuxforums.org/forum/servers/202229-how-symlink-directory-other-server-ip.html#post954743

mount: unknown filesystem type 'nfs' - Try to install nfs: sudo apt install nfs-common" (or yum install nfs-common ?)
mount.nfs: No such device - Try "modprobe nfs", if it show error like FATAL: Module nfs not found in directory /lib/modules/..., you may duck.com it or if you are on a VPS (OpenVZ), you can ask physical server admin to run that command to enable nfs kernel module.

there is more detailed tutorial: http://www.tecmint.com/how-to-setup-nfs-server-in-linux/