Can I claim FICA on Canadian return?

You will need to report your foreign income in Canadian dollars. You might get a foreign tax credit for taxes you paid in the foreign country. 

To report your foreign income and claim the tax credit, do the following:

1. In Easy Step, when you begin completing your tax profile, on the first page titled ...what happened for you in 2017?, at the first question ..did you work in 2017?, select Yes, and then select I was employed (includes commissions from employment). 

The section expands with additional choices. 

2. In the expanded section, select Foreign - Income from outside of Canada.

Thanks Jared. I was waiting for email notification for the answers to my question, but I didn't get it until I was trying to answer other person's question and found your answers. Thank you.

Do you know if "Social security tax and Medicare tax." are 100% tax deductible or 15 %?

15% for both
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/deductions-credits-expenses/line-256-additional-deductions/line-256-exempt-foreign-income.html

Thanks Jared. The link seems for income. I would like to know if I can claim social security tax withheld and medicare tax withheld against Canada tax deduction. some people said it should be 100% and some said 15%. Confused...

100% of social security taxes are added to foreign taxes paid in Canada, for the purpose of claiming FTC. 

15% is for people who receive Social security benefits from the U.S.