Thank you very much for your response.No they have to be in their home country to apply for a supervisa.
So to extend their stay only option i have is going for visitor visa extension. right?
1. If we apply for visitor visa extension multiple times, does it going to effect by any means when we apply for super visa in future
2. If super visa is in progress, can they still enter into canada (as a visitor) and once super visa is approved can they continue for 2years?