How can i change the video opacity in the editor x ?
Hey @tonyboom3d .
For any of the videos, you can Adjust the opacity for any of the videos players in the Inspector panel. You can see all three videos options (transparent, video box and video player) below are set to 60% opacity.
Definitely recommend the Academy too as there’s a video showing the settings for videos. 
https://www.editorx.com/academy/video-tutorials/video-and-decorative