Using EyeTV, the following two scripts first export the recorded file to your Desktop and then imports it to your iTunes library. Place the scripts into '/Library/Application Support/EyeTV/Scripts/TriggeredScripts' . Make sure to adjust the 'destFolder' variable according to your username.

export_done.scpt

on ExportDone(recordingID)
	
	set destFolder to "Users:ceicke:Desktop:"
	set tvShow to "bla.mp4"
	
	tell application "iTunes"
		activate
		set newTVShow to ("Macintosh HD:" & destFolder & tvShow) as alias
		add newTVShow
		quit
	end tell
end ExportDone

recording_done.scpt

on RecordingDone(recordingID)
	set destFolder to "Users:ceicke:Desktop:"
	set tvShow to "bla.mp4"
	
	tell application "EyeTV"
		set intRecordingId to recordingID as integer
		export from recording id intRecordingId to file (destFolder & tvShow) as AppleTV replacing yes
	end tell
end RecordingDone