If your question is if pools exist than yes, at least pools Voucher / Hive-P and Voucher / SPS exist.
If your question is how you can add vouchers to a liquidy pool than you should understand that you should always add a pair to the liquidy-pool, so you cannot just add Vouchers you need to add both token, so you should add Voucher + Hive-P or Voucher + SPS, tribaldex will show you the other pair if you put the first pair in, so if you tell how many Voucher you want add tribaldey tell you how many HiVE-P or SPS you have to add also to the pool.
RE: SPS & DEC Liquidity Provider Rewards + One More Ranked Rewards Update