App.js

import React, { useState, useEffect } from 'react';
import { StyleSheet ,Text, View, Button, Image} from 'react-native';
import { Camera } from 'expo-camera';
import { Video } from 'expo-av';



export default function App() {
  const [hasAudioPermission, setHasAudioPermission] = useState(null);
  const [hasCameraPermission, setHasCameraPermission] = useState(null);
  const [camera, setCamera] = useState(null);
  const [record, setRecord] = useState(null);
  const [type, setType] = useState(Camera.Constants.Type.back);
  const video = React.useRef(null);
  const [status, setStatus] = React.useState({});
  

  useEffect(() => {
    (async () => {
      const cameraStatus = await Camera.requestPermissionsAsync();
      setHasCameraPermission(cameraStatus.status === 'granted');

      const audioStatus = await Camera.requestMicrophonePermissionsAsync();
      setHasAudioPermission(audioStatus.status === 'granted');

    })();
  }, []);

  const takeVideo = async () => {
    if(camera){
        const data = await camera.recordAsync({
          maxDuration:10
        })
        setRecord(data.uri);
        console.log(data.uri);
    }
  }

  const stopVideo = async () => {
    camera.stopRecording();
  }

  if (hasCameraPermission === null || hasAudioPermission === null ) {
    return <View />;
  }
  if (hasCameraPermission === false || hasAudioPermission === false) {
    return <Text>No access to camera</Text>;
  }
  return (
    <View style={{ flex: 1}}>
        <View style={styles.cameraContainer}>
            <Camera 
            ref={ref => setCamera(ref)}
            style={styles.fixedRatio} 
            type={type}
            ratio={'4:3'} />
        </View>
        <Video
          ref={video}
          style={styles.video}
          source={{
            uri: record,
          }}
          useNativeControls
          resizeMode="contain"
          isLooping
          onPlaybackStatusUpdate={status => setStatus(() => status)}
        />
        <View style={styles.buttons}>
          <Button
            title={status.isPlaying ? 'Pause' : 'Play'}
            onPress={() =>
              status.isPlaying ? video.current.pauseAsync() : video.current.playAsync()
            }
          />
        </View>
        <Button
            title="Flip Video"
            onPress={() => {
              setType(
                type === Camera.Constants.Type.back
                  ? Camera.Constants.Type.front
                  : Camera.Constants.Type.back
              );
            }}>
          </Button>
          <Button title="Take video" onPress={() => takeVideo()} />
          <Button title="Stop Video" onPress={() => stopVideo()} />
          
    </View>
  );
}

const styles = StyleSheet.create({
  cameraContainer: {
      flex: 1,
      flexDirection: 'row'
  },
  fixedRatio:{
      flex: 1,
      aspectRatio: 1
  },
  video: {
    alignSelf: 'center',
    width: 350,
    height: 220,
  },
  buttons: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
  },
})