I will attempt to answer in French, but I should start with an apology. I once was hitchhiking near the Sahara Desert. When I arrived in Paris, the lady behind the counter at the Eiffel Tower asked me where I had learned my pidgin French. I answered: Africa. I was a Peace Corps volunteer on the Ivory Coast. My French is a bit laboured, but I will try anyway.
I would say the most effective way for Canada to proceed would be before the International Court of Justice. I say this because Canada is a state party to the Convention on the Prevention and Punishment of the Crime of Genocide, without reservations, namely with respect to article IX. Canada may prosecute Iran before the International Court of Justice in The Hague for violating the Convention on the Prevention and Punishment of the Crime of Genocide. There is nothing to prevent Canada from making the case before the International Court of Justice. Canada does not need the permission of another state to do so.
The other option would be to use article 8 of the United Nations Charter to warn the Security Council that there is a problem in Iran and that Iran is engaging in incitement to genocide. That is a violation of the Convention on the Prevention and Punishment of the Crime of Genocide. If you were to choose that avenue, the Security Council would have to consider a possible violation. The Security Council may choose not to do anything, but, at the very least, it would be on the agenda. Canada may also make a case before the UN Human Rights Council, referring to article 8 of the United Nations Charter. Both of these options are legally valid. The easiest route is to go directly to the International Court of Justice.