delete background

Hello

i have a footage with a background problem

I want to delete and be able to substitute with anything else, a color matte or any other kind of image or footage

The situation is difficult as did not shot planning to do that

Ihave done already some experiment, i see that if i kind of "spoil" the image of the dancer i might be able to delete all

So i say, i don t mind to have a kind of stylized figure for the dancer, could bve kind of videoart effect

But i want to delete the background

I attach a screenshot

Any help of different suggestion are welcome

thanks a lot