The value of tmnxMcPathChlSrcVdoGroupId specifies the row index in the
TIMETRA-VIDEO-MIB::tmnxVdoGrpTable for the video group information
for this multicast information policy bundle.
A value '0' indicates that no video-group is assigned to this
multicast channel source. A value of '-1' indicates that video-group
information is inherited from the value of tmnxMcPathBdlChlVdoGroupId
which specifies the video-group information at the channel level.