The drag created by the generator/s would use more energy than recovered,
Some people have also suggested wheel dynamos , Even in a perfect world of superconductors and zero friction it does not work.
There are lots of scams about asking for investors in such devices, but with such presentations its easy to get sucked in.
Different but Even Toyota are using a ploy to promote their Hybrids as a "Self Charging Electric Car" they have been made to stop such false advertising.
DOES NOT WORK, CAN NEVER WORK .
https://youtu.be/bkcn8ZkvKKc
https://youtu.be/ArziNmOCn90