安装AWS CLI并使用以下代码示例：

import boto3
import os
import uuid
import urllib.parse
s3 = boto3.client('s3')
def lambda_handler(event, context):
    for record in event['Records']:
        #获取事件数据 
        bucket = record['s3']['bucket']['name']
        key = urllib.parse.unquote_plus(record['s3']['object']['key'], encoding='utf-8')
        try:
            #获取S3对象
            response = s3.get_object(Bucket=bucket, Key=key)
            #复制对象到目标桶
            target_bucket = 'my-target-bucket'
            target_key = str(uuid.uuid4())
            target_copy_source = {
                'Bucket': bucket,
                'Key': key
            }
            s3.copy_object(Bucket=target_bucket, CopySource=target_copy_source, Key=target_key)
            return 'Copied video successfully'
        except Exception as e:
            print(e)
            print('Error getting object {} from bucket {}. Make sure they exist and your bucket is in the same region as this function.'.format(key, bucket))
            raise e

在lambda控制台上，确保将适当的角色分配给lambda函数以在目标桶中写入。