there are a couple ways you could make a living training. one, you could teach parkour. find someone who has a facility for exercise or something, and see if you can sell them on the idea of parkour as a legit for of exercise. teaching takes a lot of patience and the skill to properly demonstrate and explain techniques.
second, you could try and form a performance team. teams like this can be hired for big dollar events, and potentially get sponsored. i know a team that does performances, teaches classes at a gymnastics gym, and at a stuntman school(or something like that.) i dont think any of them are making enough money from that to be singularly supported by it, but they have some cool sponsors.
third, you could be a stuntman. this is probably the hardest option but the most likely to be able to pay all the bills. to be a stuntman you will have to get to know some stunt coordinators, prove that you can perform what they want on a superior level(and what they want may not always be parkour related), and possibly bring something innovative to the table every once in a while.
there are options and ive been trying to figure it out for myself aswell. good luck.