Does anyone know how to integrate recaptcha with a bootstrap_form_tag form on rails

I have a rails app and one of the pages has a form. It was designed using the bootstrap_form_tag (which, according to the bootstrap documentation is correctly done because it wasnt built with a model). I am trying to integrate reCaptcha with it, but I am having trouble adding the recaptcha_tags in it. Does anyone know how to integrate recaptcha with a bootstrap_form_tag form on rails?