We have found that some laptops and PC's that have both Intel Quick Sync and an Nvidia NVENC capable graphic cards can be affected by a "black screen" in their recording instead of gameplay.
*Note – The very first thing you can do is making sure that your graphic card is updated.
The issue seems to be related to which graphic card is assigned to Overwolf and your game. If your Overwolf process is set to use the Intel on-board graphics card and the game is set to use the Nvidia graphics card, you will get a black screen instead of the gameplay you recorded when you watch the video file.
To workaround this issue, please follow these steps:
- Launch Overwolf
Launch the Nvidia control panel (right click on the desktop)
- Open the Overwolf video recorder app and start recording
Click on "Manage 3D settings"
Go to the Program settings tab
Click on "Add" and look for a program called "Overlay" (overwolfoverlayhelper.exe) and select it
- Stop the video recording
- Make sure the Overwolf overlay process uses the same graphics card as the game you're trying to record
Here's a video guide as well (not done by Overwolf) – https://www.youtube.com/watch?v=MWUxboU7Zwg