It not as per official documentation.
For now there is no NSX-V version compatible with vSphere 7, but considering NSX-V is still being supported there should be a new release that is compatible.
That's what I suspect too, since as far as I know EOS for NSX-V is somewhere around 2022. I can just hope the nearest NSX-V release will address this.
Unfortunately you need first to migrate / switch to NSX-T first after that you can upgrade to vsphere 7. Also you can migrate in the same HW.
AFAIK vSphere 7 compatibility will be built in with NSX 6.4.7, will have to wait for the announcement...