The VBOX Video HD2 has the ability to capture up to 11 OBD channels via the OBDLink module from OBD Solutions, which plugs into the vehicle's OBD port.
 
After pairing the OBDLink with VBOX Video HD2 (pairing instructions here), it can be configured through the HD2 setup software (configuration instructions here).
 
Please note: OBDLink is only able to detect signals that are present on the CAN bus, which is dictated by the vehicle manufacturer.