Hello Andregh,

Sorry for late reply to this,
Yes, you can follow my step below to set it up
STEP 1 : Goto > Easysocial > Profile types > Select your group > Custom field > http://screencast.com/t/0ik0HCfHE
STEP 2 : http://screencast.com/t/kcTGhKIpY
STEP 3 : Goto > EasySocial > Applications > search "User — Recaptcha" > fill in the API key for the Recaptcha > http://screencast.com/t/hKZIw9aog9P

Hope this help.