Currently I'm playing with react-native-image-picker to launch camera either for capture photo or video and display on the thumnbails.
For photo, thumbnails is working just fine but for the video it's only appear a white space.
Here is my code inside pickImage function
-- photo
    const source = {uri: 'data:image/jpeg;base64,' + response.data, isStatic: true};
    let items = this.state.items;
    items.push({id:items.length, source:source});
    this.setState({items});
-- video
    const source = {uri: response.uri, isStatic: true};
    let items = this.state.items;
    items.push({id:items.length, source:source});
    this.setState({items});
hope you can help me. Thank you
 
                        
It wouldn't work if you are using
Imagecomponent from react-native to show thumbnails for video files. Currently there is no api/component that comes with react-native itself for this purpose. You can generate thumbnails using a third party library like react-native-create-thumbnail and show the thumbnails usingImage.