Hi minh.
Follow these instructions:
https://ilghera.com/support/topic/install-jw-player-7-wordpress/
https://ilghera.com/support/topic/jw-player-self-hosted-setup/
After that, set your preferences in the plugin setting page (JW Player) and publish videos by using the JW Player box in the post/ page back-end.
Hope this helps 😉