If the hospital were looking for a doctor to perform abortions they would tell him that at the interview and he would be hired on those conditions.
The majority of your OB/GYN M.D's are not in the business to do abortions at will, unless the mother's life is at risk. In response to your question, if a hospital is looking for a M.D. to do abortions, the candidate will not necessarily be told that in an interview, because OB/GYN M'D' do many types of surgeries. Usually, the hospital looks at the candidates qualifications to perform OB/GYN surgeries. A doctor can refuse to do an abortion, and a nurse can refuse to participate in it. The hospital will just get a willing doctor to do the abortion, if an ethical one refuses. That's why hospitals have medical/ethics committess and some hospitals will not even allow abortions to be done at their facility, unless the mother's life is at risk.