After doing some researches I found that what we need is already implement in Vcam_A-B_core compound

But why this option not exposed in VirtualCam_A-B_Preview_xx compound.

This effect can be useful in alot of cases ,So can aximmetry add this option in VirtualCam_A-B_Preview_xx compounds?

Yes, you are right, it's not been exposed in all kinds of VirtualCam compounds yet. It will be in future releases.

Any update on this one yet?

Having the 3 cam options (yet as for now I use only one cam).

How can I create transitions between paths?

Thank you!