How to scale video
You can give users the ability to scale the video. Just select the value
in the desired menu listing.
In this case, the corresponding option appears in the settings window.
A step of 5% is used by default and can be changed in the full version of the builder
Elements / Settings menu / Additional settings / Scale step
Settings / Hotkeys you can assign scaling to the up / down arrows, as well as to the plus / minus keys. Also there is a scale command in the JS API, so you can create your own button in the player interface to control the video scale.