Boriy wrote

MU-MIMO solves this problem by creating 3 simultaneous connections to serve several users with 3 data streams at the same time.

Sure, if you connect with 1x1 MIMO client devices, but not necessarily if you connect with a 2x2 MIMO device.

Boriy wrote
Winter bar has 47 people capacity that can sit in chairs. And it's always open.

1x EAP225 or EAP245.

Winter restaurant has 120  people capacity that can sit in chairs. Also always open.

2x EAP225 or EAP245.

Summer Terrace has 84 people capacity that can sit in chairs. However, in winter and in rainy days it will be closed. 

2x EAP225-Outdoor.

Dear Boriy,

I don't want to sound harsh. But do you want to tell us that your IT expert did just recommend UTP (unshielded twisted pair) cable, a patch panel and connection of a NVR to the router?

If so, this guy is all but not an IT expert, sorry to say.

What about the network topology? Bandwidth requirements? Network segregation? PoE power budgets? Necessary devices?

As for the cabling we had an excessive long discussion here already why for cable ducts and/or long runs one should use shielded cables, no matter wether it's CAT.5, .6, .7 or .8. Please realize that the reliability of every network depends on its weakest part, you can easily ruin the whole project by using unshielded cable to save a few cents per meter cable. And to be honest, the required cable type is nothing to worry about in such a project. An IT expert and even an electrician would just deploy shielded cables w/o much discussion about this. 

Regarding other trivialities such as a patch panel, see post #53, this shows a patch panel. What did the IT expert think how you wanted to fix cables coming out from a cable duct? Hitting a nail through the wire on the wall?

As for connecting IP cams to the NVR through a router, see post #18. You yourself have doubts that the IT expert's recommendation is correct. Why should you put a load of traffic from CCTV cams to a router, whose task is to provide Internet access, i.e. to just do routing? Of course, a real IT expert would work out a concept how to keep camera traffic away from the router and, BTW, away from the guest network. You do not want your hotel guests be able to hack a cam and stream CCTV content to their smart TV, do you? Another user here did recommend to use different physical networks for both use cases.

Somehow the whole discussion goes round and round here, we've had all these topics before.

Regarding streaming: I'm out of the streaming video business since long, but I remember what an epic fail it was when Hollywood studios did plan unicast streaming to the households of a big U.S. city (IIRC it was Denver) using TOP-100 super-computers 25 years ago. I worked at the manufacturer of those computers at this time and when we did present the requirements for the high-bandwidth fiber network, the faces of the film studio bosses froze. And back then this was only SD, not HD resolution.

Your IT expert could have told you the bandwidth requirements for streaming HD videos via unicast. Depending on the encoding scheme and quality they require around 5 to 20 Mbps for full HD and 10 to 35 Mbps for Ultra HD and 4K. Per stream mind you! Just multiply by 70 rooms for the worst case.

What did the IT expert tell you about the presentation layer for streaming? How would he set up things so guests could »just stream« from a server to a smart TV? Home theater software? Streaming software? Who will encode the 1.000 videos? What's about license fees? I'm sure there are solutions specifically for hotels, your IT expert just has to look for them.

Please try to find a real IT expert in your country who can present you a solution which leaves no questions open and who will guarantee you a reliable network concept which will work at the end, even if he has to troubleshoot this or that when unpredictable issues arise later.

I recommend to outsource this task completely to the IT expert, who then takes full responsibility for what he is doing. This is not something we can do here on the forum.