@impeham
take a look at /usr/bin/camera-ui-set-priortiy
(should be in freemangordons latest camera-ui, maybe
in the cssu-testing version as well)
it is a shell script by freemangordon which starts with camera-ui
(or when recording starts) and renices some
processes and stops the thumbnailer and tracker daemon.
You could try to include your own commands there.