I’ve just released a Video Player that runs in IntelliJ IDEA and other JetBrains IDE’s such as Android Studio or PyCharm.
It can open most of the video and audio formats.
To run it, install GStreamer, download the free Applet Runner plugin from JetBrains marketplace and execute the free Video Player applet located at https://www.japplis.com/applet-runner/player/video-player.html. You may need to restart your IDE or computer.