How to smudge part of a view in React Native?

I would like to blur part of an Image wherever user drags his finger, I don't want to blur the whole image. Here is my hacky way of doing blur

I am using @react-native-community/blur for blurring the view

const MyView = () => {  const [locations, setLocation] = useState([]);  const [top, setTop] = useState();  const [left, setLeft] = useState();  return (<><View        style={styles.container}        onTouchEnd={(event) => {          console.log(event.nativeEvent.locationX);          console.log(event.nativeEvent.locationY);          setLocation([            ...locations,            {              right: event.nativeEvent.locationX,              bottom: event.nativeEvent.locationY,              top,              left,            },          ]);        }}        onTouchStart={(event) => {          console.log('S'+ event.nativeEvent.locationX);          console.log('S'+ event.nativeEvent.locationY);          setLeft(event.nativeEvent.locationX);          setTop(event.nativeEvent.locationY);        }}><ImageBackground          style={{width, height}}          source={{            uri:'https://images.unsplash.com/photo-1593642634315-48f5414c3ad9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80',          }}><Text>Hi there </Text></ImageBackground></View>      {locations.map((l, index) => {        return (<BlurView            key={index.toString()}            style={{              width: l.right - l.left,              height: l.bottom - l.top,              backgroundColor: 'rgba(0,0,0,0.1)',              position: 'absolute',              top: parseFloat(l.top),              left: parseFloat(l.left),              right: parseFloat(l.right),              bottom: parseFloat(l.bottom),              // blurR,              // opacity: 0.4,            }}            blurType="light"            blurAmount={4}            reducedTransparencyFallbackColor="white"          />        );      })}</>);};

This is a really hacky way of smudging part of an image where user drags his finger. On Android , the application just stops responding as soon as I move my finger on more than two places. Does anyone know a better way to smudge part of view instead of blurring the whole image view where user drags his finger