Thank you Nationalsolo and borate for your suggestions! I will try them out.
Is there a way to resize the video height in order to add a header and footer block to place text that can be shown for specific periods of time? I'm not talking about putting text inside the video itself, but about adding a new header section with text above the current video, and/or adding a footer section below the video, where text can be added throughout the video. Like this...