How to read existing consumer messages without creating a consumer instance?

[yatheendra-egov]

Currently we can see the option to read messages only after creating consumer instance and subscribe it to topic. But What if I already a kafka cluster in which there are some producers and consumers doing their jobs. I don't want to create consumer instance. But I want to read messages from one of the already existing consumer groups from their current offset. Please help me how we can achieve this.