Campbell was a shock selection for interim boss Stuart Pearce's England squad in early 2012 when he came on against the Netherlands for his only senior international appearance until now.
Since then he has seen a series of strikers picked ahead of him, but he thinks he can force his way into Roy Hodgson's thoughts if he continues to impress in the Premier League.
Although he has only managed three goals so far this season, Cardiff boss Malky Mackay publicly praised his work ethic last week, feeling he has shown he belongs at the top level.
"It's hard to think about things like that, especially when you've just played in a game and your team has got beat," Campbell said.
"You don't want to think of your own targets and things like that but hopefully if the team do well, then obviously I'll do well and you never know where that might take you.
"Obviously if I manage to get on that plane to Brazil, I'd be delighted. But I can only get there by the team doing well and working hard for the team. Hopefully we can do that."