[OrMisicL]

Yes its possible, you should loop through all the connected players and check their vehicle ID

pawn Код:

stock IsVehiclePassengerOccupied(vehicleid)
{
    for(new i = 0: i < MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i) && GetPlayerVehicleID(i) == vehicleid && GetPlayerVehicleSeat(i) != 0)
            return true;
    }
    return false;
}

Thats function will return true there is a passenger in that vehicle, false otherwise