!12645 camera文档增加cameraInput open

Merge pull request !12645 from SongChunPeng/master

en/application-dev/media/camera.md

@@ -81,6 +81,9 @@ for (let index = 0; index < cameraArray.length; index++) {
 // Create a camera input stream.
 let cameraInput = await cameraManager.createCameraInput(cameraArray[0])
 
+// Open camera
+await cameraInput.open();
+
 // Obtain the output stream capabilities supported by the camera.
 let cameraOutputCap = await cameraManager.getSupportedOutputCapability(cameraArray[0]);
 if (!cameraOutputCap) {

zh-cn/application-dev/media/camera.md

@@ -81,6 +81,9 @@ for (let index = 0; index < cameraArray.length; index++) {
 // 创建相机输入流
 let cameraInput = await cameraManager.createCameraInput(cameraArray[0])
 
+// 打开相机
+await cameraInput.open();
+
 // 获取相机设备支持的输出流能力
 let cameraOutputCap = await cameraManager.getSupportedOutputCapability(cameraArray[0]);
 if (!cameraOutputCap) {