async function getImage(req, res) {
    const image = await gladys.device.camera.getImage(req.params.camera_selector);
    res.send(image);
  }
@api {get} /api/v1/camera/:camera_selector/image get Image
@apiName getImage
@apiGroup Camera
@apiSuccessExample {json} Success-Response:
image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z/C/HgAGgwJ/lK3Q6wAAAABJRU5ErkJggg==