Installation of a recess can over the shower does it need to be GFCI protected?
When you state recess can , the fixture would need to be listed for a wet location in a shower where it may get some spray. If less than 8' above the restricted zone, 410.10.b 
Per nec 210.8.a.1 all the receptacles in a bathroom are required to be GFCI protected but not the lighting.