I have just bought TCL P4USM 4K 65’’ UHD smart LED TV but how can I play Vedio from my iPhone and iPad on TV screen? Do I need chrome cast?

INSIGNIA NS-43F301NA22 43 inch Class F30 Series LED 4K UHD Smart Fire TV User Guide (manuals.plus)

Insignia NS-55F301NA22 55" Class F30 Series LED LCD 4K UHD Smart Fire TV Quick Setup Guide ' Manualzz

LED backlights are bad, common failure on this model TV but if it were mine I'd recycle it and buy a better brand set.

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TCL 50" and larger TV Parts and Accessories - PartStore.com

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TCL 50" and larger TV Parts and Accessories. TCL Replacement Parts ... 55 Inch Class P6-series 4k Uhd Dolby Hdr Roku Smart Tv, 15.

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TCL 50" and larger TV Parts and Accessories

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  TCL 50" and larger TV Parts and Accessories. TCL Replacement Parts ... 50-inch Lcd Tv, 12. 50S525, 50 Inch Class 5 Series Led 4k Uhd Smart Roku Tv, 13 ...

If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent.

Why not. Just download it.

I have found that when I am browsing on Netflix while Chrome cast is active I have to Disconnect the Chrome Cast and then Reconnect and after just a couple minutes of loading chosen item to stream....it pops up.
Good Luck

Go to Samsung Web Site, you should have all log on details in manual supplied with TV.

It depends on your source video resolution. If you're willing to play in 4K, you can upscale your 1080p or 720p video to 4K resolution in advance. Here is the video tutorial:
After conversion, it will be played in 4K on your TV. Of course, it's all based on that your TV supports 4K.