Tvheadend

Recording path looks fine - if you've any doubt, create a file in the target directory from the NAS and then see if you can see it once it's mounted.

It's probably a permission problem - su to hts and see what your effective permissions are (i.e. cd to that directory after mounting and touch a file/md a directory to see if it works).

Yes you´re right it´s a permission problem

With cifs it worked but I guess NFS would be faster

#!/bin/sh
(sleep 30; \
mount -t cifs -o username=xyz,password=xyz,rw //192.168.0.29:Port/video/TVRec /storage/TVRec -o nolock;
)&

My NFS try to get a direct mount followed by error.

OpenELEC:~ # mount -t nfs 192.168.0.29:/video/TVRec /storage/TVRec -o nolock

mount: 192.168.0.29:/video/TVRec failed, reason given by server: Permission denied
mount: mounting 192.168.0.29:/video/TVRec on /storage/TVRec failed: Bad file descriptor

Hmm, what would be the right command, as in Openelec I´ve root acess by default?

Well, you'll have root access on the OE box - not to the NAS.

How is it exported?

And can you mount the export locally, i.e. remount it on the NAS in some way?