> if it is possible to maintain friendship with high IQ people by a normal IQ people
Yes.
> Do the high IQ people find boring to maintain the thought process and conversation with low IQ people ...
Yes, but not always. High IQ !== does know everything. And usually high IQ people love to learn new things, from anyone who can teach them.
> ... and hence can not enjoy company?
No, it can be enjoyed regardless. Even when you ignore activities not based on conversation (e.g. Sports, games), sometimes you want boring conversation.
Source: My dad was in MENSA and maintained such friendships.
That having been said, I apologize for not being able to answer your actual question since I don't know the IQs of the folks I maintain friendships with. Most of them seem like they probably are higher than that range, but that might just be confirmation bias.