Hi Steve,
For system-wide control, you can set a default camera in Windows Settings under Bluetooth & devices > Cameras. This designates your preferred webcam as the primary device for most applications.
However, advanced effects like background blur and eye contact are typically managed within the individual video conferencing app you are using (such as Teams or Zoom). Look for these settings in the app's preferences or by clicking the video button during a call before you join.
If these built-in options are insufficient, some camera manufacturers like Logitech provide their own software (e.g., Logitech G Hub) that offers enhanced control and effects that can work across different applications.
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I hope this points you in the right direction. If this answer was helpful, please feel free to mark it as accepted.