AgeUSD in stake pool

Will it be possible to do staking with ageusd in a stake pool?

No. Only ADA can be used for staking. AgeUSD is (or will be) a stable coin, so theoretically there can be infinite amount of it. It would then become possible for an attacker to take over majority of stake pools at almost no cost, since they can return all stable coins back to USD after. Thus, defeating Proof of Stake protocol.
Even thou you can have multiple assets in your Cardano wallet (such as tokens, NFTs and soon AgeUSD) when the system takes a snapshot of your delegated wallet for new epoch it only counts ADA.