Adding support for Streamlabs Desktop Virtual Webcam

[DeePingXian]

Streamlabs Desktop has the same issue in #19746. This fixes it using #23460 method.

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
• The feature is well documented and sample code can be built with the project CMake

[mshabunin]

I can not test this fix, but it looks OK for me.