can i use the seed words of my online blockchain.info wallet on a trezor so i create a trezor wallet which has the same private keys as my blockchain.info wallet?And in the future i will only use my trezor wallet for transactions: I will let the blockchain.info unused.
Short answer, Yes for the reasons MeshCollector said. Solution: Transfer the coins to a new wallet that blockchain doesn't have. Once the coins are no longer associated with that address, there's no risk if Blockchain.info is hacked. You can add a second wallet/account to Trezor following the steps here: https://doc.satoshilabs.com/trezor-user/advanced_features.html
It's important to remember that who or whatever has the initial setup information you used to create your wallet (which Trezor and Blockchain.info have according to what you've written) can send money or actions using your wallet.
You only need the address to receive money, but you need wallet access to send it. If you send money out of your wallet, then there's nothing to worry about if that wallet is compromised. Simply create a new wallet, don't send it to Blockchain.info, and feel confident that the money sent to that new wallet that you keep on your Trezor remains yours even in the event of a Blockchain.info hack. The steps in the above Trezor link allow you to set up multiple accounts in your Trezor.
The idea behind hardware wallets like the trezor is that the wallet secrets, such as the seed and derived private keys, remain on the device and are never revealed to your PC. To use the seed of a blockchain.info wallet with a trezor defeats the very purpose for which you bought the trezor. I suggest instead that you setup your trezor wallet as you normally would i.e. letting it generate a new seed itself. Then restore your blockchain.info wallet on your PC using software like electrum or copay and send your coins to an address in your trezor wallet.
Note if you choose to use electrum make sure you click on options in the seed entry step and check bip39.