In order to install the Models, you need OPEN IV. (https://openiv.com/)
Once  OPEN IV is open, create a folder named MODS (if not existing)
Mods should be in path:
MODS>UPDATE>x64>DLCPACKS>ADDONPEDS>DLC.RPF>PEDS.RPF
addonpeds should also be added under the path:
OPENIV>GTAV>MODS>UPDATE>UPDATE.RPF>COMMON>DATA>DLCLIST.XML
Add the following Line:
<Item>dlcpacks:/addonpeds/</Item>
Now Download Pedselector in your GTA V 
Download Link to Pedselector:
https://www.gta5-mods.com/scripts/addonpeds-asi-pedselector
DONE.