Installing the streaming module can be a problem sometimes. This is a simple install guide which worked fine in a standard Cent5/cpanel server:
tar -xzvf apache_mod_h264_streaming-2.2.7.tar.gz
./configure --with-apxs='which apxs'
make && make install
add the following entries via vim /usr/local/apache/conf/httpd.conf
LoadModule h264_streaming_module /usr/local/apache/modules/mod_h264_streaming.so
then, cd to a public_html which is resolving correctly and run
wget -O test.mp4 "http://h264-demo.code-shop.com/demo/apache/trailer2.mp4"
You will see the opening preview credits in the first link and in the second, it should have the first 55.5 seconds removed from the original video file.