A close friend of mine did https://devbootcamp.com/ --- and coupled with the instruction and a lot of hard work in the class, was able to switch careers successfully. This was a few years ago when there was less competition amongst boot camp graduates to find jobs, but I'm still seeing devbootcamp graduates successfully change careers.

I think the combination of the kick in the ass, working on projects as a team, and access to recruiters at the end of the program is what makes them successful.