I would not recommend that. Turris Omina features a DNSSEC validating resolver which protects you from DNS spoofing. Services like Getflix actually spoofs the DNS responses which is incompatible with DNSSEC validation.
You can use it. But I would certainly not recommend using any third-party DNS resolver service at least on personal computer for security reasons. So possible solutions include:
Using a VPN terminated on Turris, to which you selective route traffic for servers in question.
If you use dedicated hardware for watching TV like Chromecast, you can set up DHCP server in a way that third-party DNS servers are served only for that dedicated device and not for instance for your personal computer
You can also disable DNSSEC validation on Omnia and forward all queries to a third-party DNS service. In that case, you are vulnerable to DNS spoofing not only by VPN operator, but also by anybody on the wire (and not necessarily on path).