Fill mode support

[choweiyuan]

Thanks in advance for your awesome suggestion of new feature for this library.

Is your feature request related to a problem? Please describe.

https://docs.videojs.com/tutorial-layout.html I want the library to be able to support fill mode too. As a developer, I may not want to use fluid mode and switch to fill mode

Describe the solution you'd like

A clear and concise description of what you want to happen.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.

[cadenzah]

Hello, and thank you for your request! I will work on it when I get time for.