Reddit reviews BNC to HDMI Converter - Female BNC Video Component Adapter Analog CVBS Input HDMI Composite Connector Box Hook up for HD TV Monitor Security Camera CCTV VCR DVRs with 720 1080P Output HDCP Deep Color
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BNC Component to HDMI Adapter - Convert CCTV BNC analog signals to HDMI,synchronized output video and audio for the exclusive audio port to input audiable signals.(Note:It's not a SDI converter.)Simple to Make the System Up and Running - Support and automatically detect input signal in PAL or NTSC format, Plug and Play then it will work like a champ to take a connect a video camera directly to a HDMI TVHDMI Output Resolution - 720P@50/60Hz, 1080P@50/60Hz; freely switch between 4:3 and 16:9 modes that can reach up to 1920*1080 on LED LCTV.Adopts a new generation of Low-power-consumption digital chip, allowing 24-hour uninterrupted and stable work, low heat releasing3D Compensation Technology: Motion optimization,color optimization and digital noise reduction that provides premium signal processing with great precision, colors, resolutions
What you are looking for is a multiplexer. However most multiplexers have an output that is a BNC connector, not a tv. You could buy this.
Podofo HD Color Video Quad Splitter CCTV Video Camera Processor System Kit Switcher Metal Case with 6 BNC Adapter https://www.amazon.com/dp/B00N4PAFKI/ref=cm_sw_r_cp_api_i_DxlnDb5PDDK48
And then this
BNC to HDMI Converter - Female BNC Video Component Adapter Analog CVBS Input HDMI Composite Connector Box Hook up for HD TV Monitor Security Camera CCTV VCR DVRs with 720 1080P Output HDCP Deep Color https://www.amazon.com/dp/B07JXYLS5T/ref=cm_sw_r_cp_api_i_fylnDb58403Z8