Check this:
https://www.canada.ca/en/immigratio...ronavirus-covid19/visitors/visa.html#existing
Send your request to this email address: 
IRCC.COVID-TravelExemptions-Exemptionsdevoyage-COVID.IRCC@cic.gc.ca
Make sure you include
•    your full name
•    your date of birth
•    if you have an application in process
•    how you applied for your visa (online or by paper)
•    your application number and unique client identifier (UCI)
•    your passport number
•    a detailed reason for travel
•    the dates you plan to travel
•    where you live now (current country of residence)
•    your supporting documents to show you’re eligible to travel to Canada at this time (for example, the application for authorization and statutory declaration for extended family members)