updated opencv documentation (camera module)

added enabling of legacy support for the camera module to the postinstall script

client/postinstall.sh

@@ -9,6 +9,8 @@ pip3 install requests flask
 echo "Setting up nginx rtmp server"
 sudo /etc/init.d/nginx start
 
+sudo raspi-config nonint do_legacy 0
+
 {
   echo 'load_module "modules/ngx_rtmp_module.so";'
   echo 'worker_processes auto;'