Yes, it is possible for a boy from Odisha and a girl from Maharashtra to get married if both are 21 years old. The Indian law permits individuals who have attained the age of 21 years to get married without the consent of their parents. However, there may be certain other factors such as religion, caste, and social norms that could impact the decision to get married, but from a legal perspective, it is possible for the boy and girl to get married if they meet the age requirement.