Yes, Galene 0.4 and later uses SVC by default when the following conditions are satisfied:

  * the sender is using a Chromium-like browser (the receiver may be Chromium, Firefox or Safari);
  * the codec is either VP8 or VP9;
  * there are at least three users in the group.

You can see a demo at https://galene.org:8443/group/public and https://galene.org:8443/group/public-vp9 (any username, empty password).

Thanks a lot for these pointers!