Do invited talks given via video-conferencing have the same weight on a CV as talks given in person?
Why would you want to try to express it yourself as a "lesser" contribution? You give much of the same value, especially if there is some facility for interaction with "attendees". 

One of the reasons for "paying" for talks is that the speaker may need to travel and deal (time and effort) with accommodation - the hassle factor. It also means time away from their normal work. The money given to speakers isn't considered "pay" for expertise in the normal sense and is often called an honorarium. 

But the effort required to prepare and actually deliver the talk is just the same as if travel were required in addition. 

And, given the current state of things, there are few other options than virtual talks. That doesn't lessen their value. It is just what we need to do now. Just as travel was once required for such talks prior to the internet. 

If you mark them at all, I suggest that you do so in a very minimal manner and certainly not separate them out from talks given in person.