Support Wowza webcam recording with mp4 extension

In order to support webcam recording with Wowza:

 - Create oflaDemo application in your Wowza server.
  - Create @WOWZA_DIR@/applications/oflaDemo directory
  - Create @WOWZA_DIR@/conf/oflaDemo directory
  - Copy @WOWZA_DIR@/conf/Application.xml to @WOWZA_DIR@/conf/oflaDemo/Application.xml.
 - Configure @WOWZA_DIR@/conf/oflaDemo/Application.xml
  - /Root/Streams/StreamType - live-record
  - /Root/Streams/StorageDir - @WEB_DIR@/content/webcam
  - /Root/Transcoder/LiveStreamTranscoder - transcoder
  - /Root/Transcoder/Templates - hdfvr.xml
 - Create @WOWZA_DIR@/transcoder/templates/hdfvr.xml template:

>     <Root>
>     	<Transcode>
>     		<Encodes>
>     			<!-- Example Encode block for source, not required unless Member of StreamNameGroup. -->
>     			<Encode>
>     				<Enable>true</Enable>
>     				<Name>aac</Name>
>     				<StreamName>mp4:${SourceStreamName}</StreamName>
>     				<Video>
>     					<!-- H.264, PassThru, Disable -->
>     					<Codec>PassThru</Codec>
>     					<Bitrate>${SourceVideoBitrate}</Bitrate>
>     					<Parameters>
>     					</Parameters>
>     				</Video>
>     				<Audio>
>     					<!-- AAC, PassThru, Disable -->
>     					<Codec>AAC</Codec>
>     					<Bitrate>48000</Bitrate>
>     				</Audio>
>     				<Properties>
>     				</Properties>
>     			</Encode>
>     		</Encodes>
>     		<Decode>
>     		</Decode>
>     		<StreamNameGroups>
>     		</StreamNameGroups>
>     		<Properties>
>     		</Properties>
>     	</Transcode>
>     </Root>

 - Make sure that @WEB_DIR@/content/webcam group is kaltura or apache
 - Define permissions stickiness on the group:
  - chmod +t @WEB_DIR@/content/webcam
  - chmod g+s @WEB_DIR@/content/webcam
 - Restart Wowza.