I guess, you can submit it to the nearest VFC office. For explicit explaination try to communicate with the CIC agents on the given contact number on its website, they will guide you well!
Tried to communicate, waiting for their reply.
At the same time, I contacted VFS Bangladesh today but they replied since the PPR letter that is received by my wife says two passport submission options (following):
1. To submit your package to London: (If she submits in Sweden, it goes to London)
2. To submit your package in Canada:
Thus, I should submit my passport along with my wife's in Sweden.
Along with that, the letter also says "All required documents must be submitted in one single package". After hearing this, VFS of Bangladesh again said that I need to submit passport in Sweden along with my wife's one.
Should I follow their instruction? One more thing I want to mention - I don't have any problem to go to Sweden and submit my passport along with my wife's passport - Just want to be sure that it won't create any problem if I submit from there.
Thanks in advance for your help.