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You should use the roslaunch param tag http://wiki.ros.org/roslaunch/XML/param

Your launch file should look like this

<launch>

 <arg name="stereo" default="multisense_sl/camera"/>
 <arg name="image_view" default="image_rect_color"/>

 <node name="stereo_cam" pkg="image_view" type="stereo_view" >
     <param name="stereo" value=$(stereo) />
     <param name="image" value=$(image_view) />
 </node>
</launch>

You should use the roslaunch param remap tag http://wiki.ros.org/roslaunch/XML/paramhttp://wiki.ros.org/roslaunch/XML/remap

Your launch file should look like this

<launch>

 <arg name="stereo" default="multisense_sl/camera"/>
 <arg name="image_view" default="image_rect_color"/>

 <node name="stereo_cam" pkg="image_view" type="stereo_view" >
     <param name="stereo" value=$(stereo) <remap from="stereo" to=$(stereo) />
     <param name="image" value=$(image_view) <remap from="image" to=$(image_view) />
 </node>
</launch>