...If you are eligible, once you receive your Acknowledgement of Receipt (AOR - anywhere from 1-4 months), then you can apply for a bridging open work permit (BOWP).
CEC
http://www.cic.gc.ca/english/immigrate/cec/index.asp
BOWP
http://www.cic.gc.ca/english/department/media/notices/2012-12-17.asp