OP, the other driver was "erratic". So do you think that overtaking him on the wrong side was safe? Or the action of a "careful and competent driver", which is the test for careless driving?
As Andy suggests, the TP's video may make him appear blameless. But even if it were to incriminate him, that wouldn't necessarily help you.
Anyway, the outcome will depend on how seriously the police and/or court view the offence.