Hi,
I provide this as a service. It would cover tuning the webserver, php, mysql and the kernel network parameters also server securing by strengthening your firewall rules(or installing a s/w firewall if none exists at present), setting up a bruteforce detection and prevention mechanism, securing apache against sql injection and xss and other generic server hardening activities.
I also have a good deal of experience with load balancer configurations using both hardware as well as software(lighttpd recommended) load balancers. So that should help in the longer run.
Besides these I also have a good deal of experience working with video(ffmpeg, fmpeg-php, mencoder, mplayer, flvtool2... the works)
Would definitely like to get an opportunity to demonstrate with this project.