One of the recent updates (April 2018) of Windows 10 has given a security feature that shuts an access of third-party applications to your microphone and a web camera.
While it is great add-on in terms of privacy one needs to change the default security settings in order to be able to record sound and video from your webcam.
How to do that:
- Open Settings from your start menu.
- Click on Privacy in order to access all your privacy settings.
- Select Camera from the left pane and then click the Change button.
- Turn on 'Camera for this device'.
- Then, turn on Allow apps to access your camera.
- Check the 'Choose which apps can access your camera' section.
You can check which applications use microphone.
Please do not forget to include the Movavi application you have in that list.
If the issue remains, we would suggest checking the webcam on another machine. Sometimes, the drivers are required to be installed once again.