I wanted to passthrough a dual tuner TV card (Hauppauge WinTV Nova-T-500) to an openVz container in order to use tvHeadEnd.
Here I show how to achieve it with this particular PCI card but the procedure should be the same for any device.
First you need to know what device/devices you want to passthrough, in my case everything under "/dev/dvb":
tree /dev/dvb/ /dev/dvb/ ├── adapter0 │ ├── demux0 │ ├── dvr0 │ ├── frontend0 │ └── net0 └── adapter1 ├── demux0 ├── dvr0 ├── frontend0 └── net0
Then you have to add them to "DEVNODES" in the configuration file of the openVZ machine you are targeting (eg: "/etc/vz/conf/114.conf") like this:
DEVNODES="dvb/adapter0/demux0:rw dvb/adapter0/dvr0:rw dvb/adapter0/frontend0:rw dvb/adapter0/net0:rw dvb/adapter1/demux0:rw dvb/adapter1/dvr0:rw dvb/adapter1/frontend0:rw dvb/adapter1/net0:rw"
Instead of adding the entries manually, you can also use vzctl.
Hope it helps!