Is it possible for one professional with a closed work permit to attend a full time boot camp hosted by some for profit institution instead of universities, given that this professional is no longer at his/her job but work permit is still valid?
A boot camp like an exercise regime? That's not education, so I don't know why you wouldn't be able to attend it. If it is an educational program, is its duration less than six months?
As long as you don't violate the terms of your work permit, which includes not studying without a permit. This 'boot camp' doesn't sound like it would require a study permit so knock yourself out.