it's possible by client injections.
without injections, you'd need the client sources to do this, and only cipsoft has those sources.
Thou you could try YATC(Yet Another Tibia Client) that was a open-source tibia client made in the OT community, however YATC isn't that stable from what I understand.
And the project seems very dead.
But there you have it.. possible, Yes.. easy, no..