i delete my hyper v farm ressource container in be2012 and cant found the option to add it again.
Are you looking for adding hyperv host in BE2012 or you are reffering about sharpoint farm
If this is about hyperv then you need to go to hpyerv host server and there click on start all programs and click on backup exec remote agent utility
Then click on publishing and enter the fqdn name of Media server and then enter domain\username and password and click on enter and once done please restart remote agent services on both hyperv server and Media server and reopen the console and you will see the hyperv Host and once you open the selection you would see the machine under it.
If this is about sharepoint farm then check link below
Hope that helps
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