diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6c67ce0..2d6e440 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,17 @@ LIST(APPEND CMAKE_PREFIX_PATH third_party/glog/_build)
 find_package(glog REQUIRED)
 message(STATUS "Found glog: ${glog_VERSION}")
 
+if(WITH_API)
+  find_package(OpenCV REQUIRED)
+  message(STATUS "Found OpenCV: ${OpenCV_VERSION}")
+
+  if(OpenCV_VERSION VERSION_LESS 3.0)
+    add_definitions(-DUSE_OPENCV2)
+  else()
+    add_definitions(-DUSE_OPENCV3)
+  endif()
+endif()
+
 LIST(APPEND CMAKE_MODULE_PATH cmake)
 
 include(CMakePackageConfigHelpers)
@@ -136,6 +147,9 @@ set(MYNTEYE_LINKLIBS
   glog::glog
   ${UVC_LIB}
 )
+if(WITH_API)
+  list(APPEND MYNTEYE_LINKLIBS ${OpenCV_LIBS})
+endif()
 #message(STATUS "MYNTEYE_LINKLIBS: ${MYNTEYE_LINKLIBS}")
 
 add_library(${MYNTEYE_NAME} SHARED ${MYNTEYE_SRCS})
diff --git a/samples/README.md b/samples/README.md
index e4747b6..2bb4ff4 100644
--- a/samples/README.md
+++ b/samples/README.md
@@ -21,6 +21,17 @@ make samples
 
 ## Run
 
+Camera with api layer,
+
+```bash
+./samples/_output/bin/api/camera_a
+
+# Windows
+.\samples\_output\bin\api\camera_a.bat
+```
+
+Camera with device layer,
+
 ```bash
 ./samples/_output/bin/device/camera_d
 
diff --git a/samples/api/camera.cc b/samples/api/camera.cc
index d484623..92546ab 100644
--- a/samples/api/camera.cc
+++ b/samples/api/camera.cc
@@ -7,5 +7,7 @@ MYNTEYE_USE_NAMESPACE
 int main(int argc, char *argv[]) {
   glog_init _(argc, argv);
 
+  auto &&api = API::Create();
+
   return 0;
 }
diff --git a/src/api/api.cc b/src/api/api.cc
index 043035e..543bcb4 100644
--- a/src/api/api.cc
+++ b/src/api/api.cc
@@ -2,9 +2,13 @@
 
 #include <glog/logging.h>
 
+#include "mynteye/utils.h"
+
+#include "device/device.h"
+
 MYNTEYE_BEGIN_NAMESPACE
 
-API::API() {
+API::API(std::shared_ptr<Device> device) : device_(device) {
   VLOG(2) << __func__;
 }
 
@@ -12,4 +16,12 @@ API::~API() {
   VLOG(2) << __func__;
 }
 
+std::shared_ptr<API> API::Create() {
+  return Create(device::select());
+}
+
+std::shared_ptr<API> API::Create(std::shared_ptr<Device> device) {
+  return std::make_shared<API>(device);
+}
+
 MYNTEYE_END_NAMESPACE
diff --git a/src/api/api.h b/src/api/api.h
index 12dc9fc..db1c925 100644
--- a/src/api/api.h
+++ b/src/api/api.h
@@ -2,14 +2,24 @@
 #define MYNTEYE_API_H_
 #pragma once
 
+#include <memory>
+
 #include "mynteye/mynteye.h"
 
 MYNTEYE_BEGIN_NAMESPACE
 
+class Device;
+
 class MYNTEYE_API API {
  public:
-  API();
-  ~API();
+  explicit API(std::shared_ptr<Device> device);
+  /*virtual*/ ~API();
+
+  static std::shared_ptr<API> Create();
+  static std::shared_ptr<API> Create(std::shared_ptr<Device> device);
+
+ private:
+  std::shared_ptr<Device> device_;
 };
 
 MYNTEYE_END_NAMESPACE