DO NOT DO THIS
You are interviewing at a bank. They SHOULD know better than to ask you for this information.
It is possible that they believe your "bank account card" is just a simple "EC card" which may not contain any security features. They may not be aware that there are some banks that use a single card for transactions as well as for bank purposes. See undefined's answer for more information.
However, don't be caught in the game where you ask for reasons on why you should send pictures of your card. There is NO REASON why they need actual pictures of your bank card. So don't even invite them to say things that are not true and attempt to confuse you.
Here are some examples of common BS reasons given:
- It's company policy
- Everybody is required to
- We can't pay you without it
- It's required by government regulations
- You can trust us, we are a bank
- We just need some information from it
- We need to verify your identity
- So you can be protected from cyber attacks
- (Anything else that is said)
They may say they are trying to prevent transcription errors, if you were to type out, for instance, your IBAN. However, it is far better to copy and paste that from an online statement, and allow them to copy and paste from the email into their HR system, than take photos and hope their staff manually transcribe correctly.
Regarding the card, there is often not just a CVV number, but there can be other security measures on that card, that you leak by trying to be clever, taking a screenshot, and blurring things out. For instance, on my Visa card, there is an additional code that some merchants use to verify the card is in my possession. So DON'T SEND A PICTURE OF THE CARD, even with blurring.
Because you are in Austria, simply send them either your IBAN, or your bank name, branch name, and account number. If they need more than that, contact YOUR bank, and ask for their advice.