Although I have not had a bank account through Capital One, I have had a couple different card options through them over the years. While the interest rates are a little high, the cards are easy to obtain. Capital One is a great option for anyone, and they have a card to fit practically every credit/financial situation. Plus if you use them for loan services, it can help you get accepted for a card, and/or help to increase your credit line quicker.
The application process is very quick. After putting in my information, I was approved in just a few minutes; and using the Capital One Wallet app, I had the ability to use my credit limit instantly.
If you're looking for a card to help build your credit, easy to apply, and easy to obtain; then check out a card from Capital One.