As per the code of conduct, PDF available online of Canara Bank, there are no such restrictions regarding Husband & wife working together. So you can suddenly apply, but I would recommend you during the HR rounds you should mention this fact so that laterwards, you may not be claimed to provide the Discrepancy of Information to the authorities.

For the code of conduct, you can consider the link below:

https://canarabank.com/media/2324/Conduct.pdf

I hope this helps. Wish you a great eve!