i have a SM-J7008 which was recently flashed but has no google apps installed. i read it was possible to in stall them using busybox. i would like a little more detail with the method mentioned here:
If you want to install without modifying /system then it's impossible. So the answer is "No, you can't" with neither root access nor recovery flashing. But if you simply wany to DIY without using a custom recovery, it's OK. Takine OpenGApps as example. Download their ZIP and extract it.
Install BusyBox Use busybox lunzip to extract the .tar.lz files in Core/ Move files other than APKs to /system. You will find things to be merges into etc/ and framework/. Take care of file mode (permissions)
and owner/group. Install GoogleServicesFramework.apk as system app. In my experiments it sometimes fail if not installed as system app. Install the rest of the APKs as normal.
You can't install GApps without modifying /system. As you see, there are quite a few configuration files that will be merged into /system/etc during installation, and a few essential framework JARs to be installed to '/system/framework. They won't work if installed elsewhere.