Hello,
WebEx recordings use proprietary ARF format that plays back inside of WebEx NBR playback utility. It is possible to provide a streaming URL, but the recording will play in the WebEx application. It is possible to download the recording and use the NBR playback utility to convert the file to WMV, MP4, or FLV, for embedded webpage viewing, but it is generally recommended to leave it in original format for quality purposes. You can use XML API command LstRecording to retrieve a list of recordings, along with streaming URL.