dic[@"bgType"]=0;//Background type. 0 means image, 1 means video.
dic[@"bgPath"]=@"/var/mobile/Containers/Data/Application/06B00BBC-9060-450F-8D3A-F6028D185682/Documents/MediaFile/image.png";//Absolute path of custom background image. If video is selected as custom background, perform compression transcoding process and use the absolute path after processing.