Hi there,
They Canadian embassy in Cuba can issue you with a tourist visa and you can apply as you would do normally. Some of the requirements are:
* You must have a valid passport.
* Two recent passport photos that meet the requirements.
* You must provide proof that you have enough money for your visit to
Canada.
* A $75 non-refundable fee.
You can get more information
here
Hope this helps
VacationBuddy