marrying canadian citizen

She has to approach Canadian embassy ,diplomat,consul ,high commission or any in Delhi along with necessary documents .l

Yes the procedure would be under special marriage act.
the Delhi guy has to approach the local register office based in Delhi to find out which documents to produce for this to the marrige to take place.
If either of the party is married then the marriage should not take place otherwise it will be void.

My friend Shashi Dhara is explaining the process to migrate to Canada.
For this to happen yes you would need to approach the Canadian Embassy.

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Contact me for details with regards to international marriage between Indian with a foreigner in Delhi/NCR. vijaymahajan5758@gmail.com