The application of multimedia resources during classes is becoming increasingly usual, making the learning process more participatory and interactive. Learning Objects (LOs) are entities, digital or not, that can be used, reused or referenced during teaching process. The multimedia authoring of LOs is still a complex and time-consuming process. The purpose of this paper is to present the process of participatory design used in the development of Cacuriá, a tool that allows teachers and tutors to create and share videos enriched with interactive multimedia contents. Cacuriá interface was developed using Participatory Design techniques, including focus group, Card Sorting and Paper Prototyping followed by an enhancement of the interface design. This paper also describes implementation architecture of Cacuriá. Finally, a case study was conducted to present a possibility of OAs creation using the Cacuriá Tool without requiring the user to previously knowing programming concepts.