This is easy just track incomming ip adresses:

Code:
$_SERVER['REMOTE_ADDR']
and referers:

Code:
$_SERVER['HTTP_REFERER'];
Update the database on unique hits and add a point to that vid

Also to prevent cheating add a timestamp:

Code:
  //** Make sure it's been 24 hours since they last visited**//

 $timestamp = //database row here;
  $current_timestamp = time();
  if($timestamp and (($timestamp + 86400) < $current_timestamp))
  {
//query here
  }
  elseif(!$timestamp)
  {
//query here
  }
The rest is preference