Error C2015

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Hi I have a question again: I'm writing program for capturing video from my camera in Opencv and this is the program:

#include "opencv2/opencv.hpp"
using namespace cv;

int main(int, char**)
{
    VideoCapture cap(0);

    if (!cap.isOpened())
        return -1;
    while (1)
    {
        Mat frame;
        cap.read(frame);
        imshow('video', frame);

        if (waitKey(30) == 's')
        {
            break;
        }
    }
    return 0;
}

But when i compile this program i've got the error on "imshow('video', frame); It's Error C2015:too many characters in constant How can i fix this? Thank you so much