Following patch adds new dio-interface driver - the blobtracker. This driver subscribes to blobfinder and ptz device. It sends ptz commands in order to make camera follow certain blobs. Blob detection is signalled through the dio interface. It is just a toy, still it may be found useful.
Part of driver description is missing, I'm adding this patch file once again
The changes have been made in SVN trunk.
Thank you for your contribution.