I moved this thread to the VirusScan community. Hopefully someone can help you soon!
You can try this. Just add the OnSSI video surveillance application directory / services to the On-Access Scanner exclusions list so VSE will not be causing any slow performance or whatsoever. Also, pay attention to your access protection logs as sometimes it tends to block "valid applications". As what happened to us before, we have this surveillance sumthing application and the access protection is blocking a creation of an exe file to the TEMP folder therefore preventing the surveillance application from recording.
Hope this helps