Thank you for reaching out to the Community. That is a great question! The video block does stand on its own, so you will need to add a separate block above it. You can add a Header block or a regular text block to add in your title.
In the meantime, if you have any further questions please feel free to reach out to us here. We are always happy to assist you in any way we can!
So sorry you are not able to see a header block! These header blocks can be found under the Layout section of your email's Build tab.
The pre-built layouts on the right with a background color in the image will have a background color when added into your template. I hope this helps!