Use one or the other, two apps can't read the same video camera device at the same time.
Motion is capable of running a script on event detection, so if you want to do that look in the config for on_area_detected or on_movie_start
Then get it to call some kind of shell script that attaches the current photo and emails it to you.
Hope you don't get too many events, else there will be too many emails to find the important ones.